Finding the Fourth Proportional to 78,391.69, 108,182.50 and 42,581.70

Step by Step Solution

1. Step 1: Write the proportion equation
   78,391.69 : 108,182.50 = 42,581.70 : x
2. Step 2: Convert to fraction form
   78,391.69/108,182.50 = 42,581.70/x
3. Step 3: Cross multiply
   78,391.69x = 108,182.50 × 42,581.70
4. Step 4: Simplify right side
   78,391.69x = 4,606,594,653.80
5. Step 5: Solve for x
   x = 4,606,594,653.80/78,391.69
6. Step 6: Final answer
   x = 58,763.82