Finding the Fourth Proportional to 13,665.71, 20,501.31 and 4,308.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,665.71 : 20,501.31 = 4,308.10 : x
2. Step 2: Convert to fraction form
   13,665.71/20,501.31 = 4,308.10/x
3. Step 3: Cross multiply
   13,665.71x = 20,501.31 × 4,308.10
4. Step 4: Simplify right side
   13,665.71x = 88,321,693.61
5. Step 5: Solve for x
   x = 88,321,693.61/13,665.71
6. Step 6: Final answer
   x = 6,463.02