Finding the Fourth Proportional to 78,719.73, 108,631.59 and 42,909.42

Step by Step Solution

1. Step 1: Write the proportion equation
   78,719.73 : 108,631.59 = 42,909.42 : x
2. Step 2: Convert to fraction form
   78,719.73/108,631.59 = 42,909.42/x
3. Step 3: Cross multiply
   78,719.73x = 108,631.59 × 42,909.42
4. Step 4: Simplify right side
   78,719.73x = 4,661,318,520.58
5. Step 5: Solve for x
   x = 4,661,318,520.58/78,719.73
6. Step 6: Final answer
   x = 59,214.11