Finding the Fourth Proportional to 103,772.09, 155,658.17 and 80,114.15

Step by Step Solution

1. Step 1: Write the proportion equation
   103,772.09 : 155,658.17 = 80,114.15 : x
2. Step 2: Convert to fraction form
   103,772.09/155,658.17 = 80,114.15/x
3. Step 3: Cross multiply
   103,772.09x = 155,658.17 × 80,114.15
4. Step 4: Simplify right side
   103,772.09x = 12,470,422,569.54
5. Step 5: Solve for x
   x = 12,470,422,569.54/103,772.09
6. Step 6: Final answer
   x = 120,171.25