Finding the Fourth Proportional to 78,498.67, 108,328.89 and 42,689.02

Step by Step Solution

1. Step 1: Write the proportion equation
   78,498.67 : 108,328.89 = 42,689.02 : x
2. Step 2: Convert to fraction form
   78,498.67/108,328.89 = 42,689.02/x
3. Step 3: Cross multiply
   78,498.67x = 108,328.89 × 42,689.02
4. Step 4: Simplify right side
   78,498.67x = 4,624,454,151.79
5. Step 5: Solve for x
   x = 4,624,454,151.79/78,498.67
6. Step 6: Final answer
   x = 58,911.24