Finding the Fourth Proportional to 116,390.85, 160,680.69 and 78,350.43

Step by Step Solution

1. Step 1: Write the proportion equation
   116,390.85 : 160,680.69 = 78,350.43 : x
2. Step 2: Convert to fraction form
   116,390.85/160,680.69 = 78,350.43/x
3. Step 3: Cross multiply
   116,390.85x = 160,680.69 × 78,350.43
4. Step 4: Simplify right side
   116,390.85x = 12,589,401,154.20
5. Step 5: Solve for x
   x = 12,589,401,154.20/116,390.85
6. Step 6: Final answer
   x = 108,164.87