Finding the Fourth Proportional to 77,404.20, 116,139.18 and 42,302.85

Step by Step Solution

1. Step 1: Write the proportion equation
   77,404.20 : 116,139.18 = 42,302.85 : x
2. Step 2: Convert to fraction form
   77,404.20/116,139.18 = 42,302.85/x
3. Step 3: Cross multiply
   77,404.20x = 116,139.18 × 42,302.85
4. Step 4: Simplify right side
   77,404.20x = 4,913,018,310.66
5. Step 5: Solve for x
   x = 4,913,018,310.66/77,404.20
6. Step 6: Final answer
   x = 63,472.24