Based on the information provided, the total contract value can be estimated by adding up the prices of the individual items. The prices listed are: $10,574.46, $11,542.63, $21,148.92, $23,085.26, $13,035.33, $26,070.66, $3,489.56, $5,988.50, $12,540.86, $12,646.79, $25,081.72, $25,293.58, $13,514.76, and $27,029.52. However, these prices seem to be for different items and vendors, and it's not clear which ones are actually part of the contract. Assuming that the contract includes the purchase of 5 riding lawnmowers, with prices ranging from $10,000 to $27,000, the total contract value could be estimated to be around $54,000.