Finding the Fourth Proportional to 78,501.38, 108,331.36 and 42,691.30

Step by Step Solution

1. Step 1: Write the proportion equation
   78,501.38 : 108,331.36 = 42,691.30 : x
2. Step 2: Convert to fraction form
   78,501.38/108,331.36 = 42,691.30/x
3. Step 3: Cross multiply
   78,501.38x = 108,331.36 × 42,691.30
4. Step 4: Simplify right side
   78,501.38x = 4,624,806,211.61
5. Step 5: Solve for x
   x = 4,624,806,211.61/78,501.38
6. Step 6: Final answer
   x = 58,913.70