Finding the Fourth Proportional to 21,022.71, 29,013.39 and 15,708.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,022.71 : 29,013.39 = 15,708.30 : x
2. Step 2: Convert to fraction form
   21,022.71/29,013.39 = 15,708.30/x
3. Step 3: Cross multiply
   21,022.71x = 29,013.39 × 15,708.30
4. Step 4: Simplify right side
   21,022.71x = 455,751,034.14
5. Step 5: Solve for x
   x = 455,751,034.14/21,022.71
6. Step 6: Final answer
   x = 21,678.99