Finding the Fourth Proportional to 103,949.30, 155,693.55 and 80,499.70

Step by Step Solution

1. Step 1: Write the proportion equation
   103,949.30 : 155,693.55 = 80,499.70 : x
2. Step 2: Convert to fraction form
   103,949.30/155,693.55 = 80,499.70/x
3. Step 3: Cross multiply
   103,949.30x = 155,693.55 × 80,499.70
4. Step 4: Simplify right side
   103,949.30x = 12,533,284,066.94
5. Step 5: Solve for x
   x = 12,533,284,066.94/103,949.30
6. Step 6: Final answer
   x = 120,571.13