Finding the Fourth Proportional to 123,753.15, 185,599.96 and 57,129.31

Step by Step Solution

1. Step 1: Write the proportion equation
   123,753.15 : 185,599.96 = 57,129.31 : x
2. Step 2: Convert to fraction form
   123,753.15/185,599.96 = 57,129.31/x
3. Step 3: Cross multiply
   123,753.15x = 185,599.96 × 57,129.31
4. Step 4: Simplify right side
   123,753.15x = 10,603,197,650.83
5. Step 5: Solve for x
   x = 10,603,197,650.83/123,753.15
6. Step 6: Final answer
   x = 85,680.22