Finding the Fourth Proportional to 8,280, 12,402.56 and 5,161.52

Step by Step Solution

1. Step 1: Write the proportion equation
   8,280 : 12,402.56 = 5,161.52 : x
2. Step 2: Convert to fraction form
   8,280/12,402.56 = 5,161.52/x
3. Step 3: Cross multiply
   8,280x = 12,402.56 × 5,161.52
4. Step 4: Simplify right side
   8,280x = 64,016,061.49
5. Step 5: Solve for x
   x = 64,016,061.49/8,280
6. Step 6: Final answer
   x = 7,731.41