Finding the Fourth Proportional to 78,490.62, 108,317.25 and 42,680.61

Step by Step Solution

1. Step 1: Write the proportion equation
   78,490.62 : 108,317.25 = 42,680.61 : x
2. Step 2: Convert to fraction form
   78,490.62/108,317.25 = 42,680.61/x
3. Step 3: Cross multiply
   78,490.62x = 108,317.25 × 42,680.61
4. Step 4: Simplify right side
   78,490.62x = 4,623,046,303.52
5. Step 5: Solve for x
   x = 4,623,046,303.52/78,490.62
6. Step 6: Final answer
   x = 58,899.35