Finding the Fourth Proportional to 78,280.29, 108,026.80 and 42,470.30

Step by Step Solution

1. Step 1: Write the proportion equation
   78,280.29 : 108,026.80 = 42,470.30 : x
2. Step 2: Convert to fraction form
   78,280.29/108,026.80 = 42,470.30/x
3. Step 3: Cross multiply
   78,280.29x = 108,026.80 × 42,470.30
4. Step 4: Simplify right side
   78,280.29x = 4,587,930,780.58
5. Step 5: Solve for x
   x = 4,587,930,780.58/78,280.29
6. Step 6: Final answer
   x = 58,609.02