Finding the Fourth Proportional to 83,428.90, 125,146.43 and 42,891.57

Step by Step Solution

1. Step 1: Write the proportion equation
   83,428.90 : 125,146.43 = 42,891.57 : x
2. Step 2: Convert to fraction form
   83,428.90/125,146.43 = 42,891.57/x
3. Step 3: Cross multiply
   83,428.90x = 125,146.43 × 42,891.57
4. Step 4: Simplify right side
   83,428.90x = 5,367,726,862.60
5. Step 5: Solve for x
   x = 5,367,726,862.60/83,428.90
6. Step 6: Final answer
   x = 64,338.94