Finding the Fourth Proportional to 21,022.59, 29,013.24 and 15,708.18

Step by Step Solution

1. Step 1: Write the proportion equation
   21,022.59 : 29,013.24 = 15,708.18 : x
2. Step 2: Convert to fraction form
   21,022.59/29,013.24 = 15,708.18/x
3. Step 3: Cross multiply
   21,022.59x = 29,013.24 × 15,708.18
4. Step 4: Simplify right side
   21,022.59x = 455,745,112.45
5. Step 5: Solve for x
   x = 455,745,112.45/21,022.59
6. Step 6: Final answer
   x = 21,678.83