Finding the Fourth Proportional to 123,780.62, 185,641.05 and 57,156.70

Step by Step Solution

1. Step 1: Write the proportion equation
   123,780.62 : 185,641.05 = 57,156.70 : x
2. Step 2: Convert to fraction form
   123,780.62/185,641.05 = 57,156.70/x
3. Step 3: Cross multiply
   123,780.62x = 185,641.05 × 57,156.70
4. Step 4: Simplify right side
   123,780.62x = 10,610,629,338.43
5. Step 5: Solve for x
   x = 10,610,629,338.43/123,780.62
6. Step 6: Final answer
   x = 85,721.25