Finding the Fourth Proportional to 68,458.56, 102,454.20 and 57,377.76

Step by Step Solution

1. Step 1: Write the proportion equation
   68,458.56 : 102,454.20 = 57,377.76 : x
2. Step 2: Convert to fraction form
   68,458.56/102,454.20 = 57,377.76/x
3. Step 3: Cross multiply
   68,458.56x = 102,454.20 × 57,377.76
4. Step 4: Simplify right side
   68,458.56x = 5,878,592,498.59
5. Step 5: Solve for x
   x = 5,878,592,498.59/68,458.56
6. Step 6: Final answer
   x = 85,870.82