Finding the Fourth Proportional to 78,500.45, 108,329.61 and 42,689.70

Step by Step Solution

1. Step 1: Write the proportion equation
   78,500.45 : 108,329.61 = 42,689.70 : x
2. Step 2: Convert to fraction form
   78,500.45/108,329.61 = 42,689.70/x
3. Step 3: Cross multiply
   78,500.45x = 108,329.61 × 42,689.70
4. Step 4: Simplify right side
   78,500.45x = 4,624,557,917.99
5. Step 5: Solve for x
   x = 4,624,557,917.99/78,500.45
6. Step 6: Final answer
   x = 58,911.23