Finding the Fourth Proportional to 12,447.50, 17,177.56 and 7,142.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,447.50 : 17,177.56 = 7,142.10 : x
2. Step 2: Convert to fraction form
   12,447.50/17,177.56 = 7,142.10/x
3. Step 3: Cross multiply
   12,447.50x = 17,177.56 × 7,142.10
4. Step 4: Simplify right side
   12,447.50x = 122,683,851.28
5. Step 5: Solve for x
   x = 122,683,851.28/12,447.50
6. Step 6: Final answer
   x = 9,856.10