Finding the Fourth Proportional to 21,200.41, 31,807.53 and 10,665.00

Step by Step Solution

1. Step 1: Write the proportion equation
   21,200.41 : 31,807.53 = 10,665.00 : x
2. Step 2: Convert to fraction form
   21,200.41/31,807.53 = 10,665.00/x
3. Step 3: Cross multiply
   21,200.41x = 31,807.53 × 10,665.00
4. Step 4: Simplify right side
   21,200.41x = 339,227,095.09
5. Step 5: Solve for x
   x = 339,227,095.09/21,200.41
6. Step 6: Final answer
   x = 16,000.97