Finding the Fourth Proportional to 21,047.40, 29,047.46 and 15,732.99

Step by Step Solution

1. Step 1: Write the proportion equation
   21,047.40 : 29,047.46 = 15,732.99 : x
2. Step 2: Convert to fraction form
   21,047.40/29,047.46 = 15,732.99/x
3. Step 3: Cross multiply
   21,047.40x = 29,047.46 × 15,732.99
4. Step 4: Simplify right side
   21,047.40x = 457,003,319.04
5. Step 5: Solve for x
   x = 457,003,319.04/21,047.40
6. Step 6: Final answer
   x = 21,713.05