Finding the Fourth Proportional to 12,155.52, 16,778.25 and 7,120.83

Step by Step Solution

1. Step 1: Write the proportion equation
   12,155.52 : 16,778.25 = 7,120.83 : x
2. Step 2: Convert to fraction form
   12,155.52/16,778.25 = 7,120.83/x
3. Step 3: Cross multiply
   12,155.52x = 16,778.25 × 7,120.83
4. Step 4: Simplify right side
   12,155.52x = 119,475,065.95
5. Step 5: Solve for x
   x = 119,475,065.95/12,155.52
6. Step 6: Final answer
   x = 9,828.87