Finding the Fourth Proportional to 71,061.43, 106,573.58 and 21,128.08

Step by Step Solution

1. Step 1: Write the proportion equation
   71,061.43 : 106,573.58 = 21,128.08 : x
2. Step 2: Convert to fraction form
   71,061.43/106,573.58 = 21,128.08/x
3. Step 3: Cross multiply
   71,061.43x = 106,573.58 × 21,128.08
4. Step 4: Simplify right side
   71,061.43x = 2,251,694,485.62
5. Step 5: Solve for x
   x = 2,251,694,485.62/71,061.43
6. Step 6: Final answer
   x = 31,686.59