Finding the Fourth Proportional to 123,766.60, 185,620.17 and 57,142.75

Step by Step Solution

1. Step 1: Write the proportion equation
   123,766.60 : 185,620.17 = 57,142.75 : x
2. Step 2: Convert to fraction form
   123,766.60/185,620.17 = 57,142.75/x
3. Step 3: Cross multiply
   123,766.60x = 185,620.17 × 57,142.75
4. Step 4: Simplify right side
   123,766.60x = 10,606,846,969.27
5. Step 5: Solve for x
   x = 10,606,846,969.27/123,766.60
6. Step 6: Final answer
   x = 85,700.40