Finding the Fourth Proportional to 83,386.62, 125,080.71 and 21,057.06

Step by Step Solution

1. Step 1: Write the proportion equation
   83,386.62 : 125,080.71 = 21,057.06 : x
2. Step 2: Convert to fraction form
   83,386.62/125,080.71 = 21,057.06/x
3. Step 3: Cross multiply
   83,386.62x = 125,080.71 × 21,057.06
4. Step 4: Simplify right side
   83,386.62x = 2,633,832,015.31
5. Step 5: Solve for x
   x = 2,633,832,015.31/83,386.62
6. Step 6: Final answer
   x = 31,585.79