Finding the Fourth Proportional to 8,155.28, 12,287.74 and 7,376.15

Step by Step Solution

1. Step 1: Write the proportion equation
   8,155.28 : 12,287.74 = 7,376.15 : x
2. Step 2: Convert to fraction form
   8,155.28/12,287.74 = 7,376.15/x
3. Step 3: Cross multiply
   8,155.28x = 12,287.74 × 7,376.15
4. Step 4: Simplify right side
   8,155.28x = 90,636,133.52
5. Step 5: Solve for x
   x = 90,636,133.52/8,155.28
6. Step 6: Final answer
   x = 11,113.80