Finding the Fourth Proportional to 78,719.79, 108,631.15 and 42,910.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,719.79 : 108,631.15 = 42,910.50 : x
2. Step 2: Convert to fraction form
   78,719.79/108,631.15 = 42,910.50/x
3. Step 3: Cross multiply
   78,719.79x = 108,631.15 × 42,910.50
4. Step 4: Simplify right side
   78,719.79x = 4,661,416,854.80
5. Step 5: Solve for x
   x = 4,661,416,854.80/78,719.79
6. Step 6: Final answer
   x = 59,215.31