Finding the Fourth Proportional to 123,780.49, 185,640.87 and 57,156.58

Step by Step Solution

1. Step 1: Write the proportion equation
   123,780.49 : 185,640.87 = 57,156.58 : x
2. Step 2: Convert to fraction form
   123,780.49/185,640.87 = 57,156.58/x
3. Step 3: Cross multiply
   123,780.49x = 185,640.87 × 57,156.58
4. Step 4: Simplify right side
   123,780.49x = 10,610,597,237.42
5. Step 5: Solve for x
   x = 10,610,597,237.42/123,780.49
6. Step 6: Final answer
   x = 85,721.08