Finding the Fourth Proportional to 9,146.28, 12,621.92 and 5,167.76

Step by Step Solution

1. Step 1: Write the proportion equation
   9,146.28 : 12,621.92 = 5,167.76 : x
2. Step 2: Convert to fraction form
   9,146.28/12,621.92 = 5,167.76/x
3. Step 3: Cross multiply
   9,146.28x = 12,621.92 × 5,167.76
4. Step 4: Simplify right side
   9,146.28x = 65,227,053.30
5. Step 5: Solve for x
   x = 65,227,053.30/9,146.28
6. Step 6: Final answer
   x = 7,131.54