Finding the Fourth Proportional to 71,061.93, 106,574.32 and 21,128.58

Step by Step Solution

1. Step 1: Write the proportion equation
   71,061.93 : 106,574.32 = 21,128.58 : x
2. Step 2: Convert to fraction form
   71,061.93/106,574.32 = 21,128.58/x
3. Step 3: Cross multiply
   71,061.93x = 106,574.32 × 21,128.58
4. Step 4: Simplify right side
   71,061.93x = 2,251,764,046.07
5. Step 5: Solve for x
   x = 2,251,764,046.07/71,061.93
6. Step 6: Final answer
   x = 31,687.35