Finding the Fourth Proportional to 78,516.50, 108,354.98 and 42,708.80

Step by Step Solution

1. Step 1: Write the proportion equation
   78,516.50 : 108,354.98 = 42,708.80 : x
2. Step 2: Convert to fraction form
   78,516.50/108,354.98 = 42,708.80/x
3. Step 3: Cross multiply
   78,516.50x = 108,354.98 × 42,708.80
4. Step 4: Simplify right side
   78,516.50x = 4,627,711,547.48
5. Step 5: Solve for x
   x = 4,627,711,547.48/78,516.50
6. Step 6: Final answer
   x = 58,939.35