Finding the Fourth Proportional to 116,391.87, 160,681.86 and 78,351.57

Step by Step Solution

1. Step 1: Write the proportion equation
   116,391.87 : 160,681.86 = 78,351.57 : x
2. Step 2: Convert to fraction form
   116,391.87/160,681.86 = 78,351.57/x
3. Step 3: Cross multiply
   116,391.87x = 160,681.86 × 78,351.57
4. Step 4: Simplify right side
   116,391.87x = 12,589,676,001.52
5. Step 5: Solve for x
   x = 12,589,676,001.52/116,391.87
6. Step 6: Final answer
   x = 108,166.28