Finding the Fourth Proportional to 9,146.31, 12,621.28 and 5,167.18

Step by Step Solution

1. Step 1: Write the proportion equation
   9,146.31 : 12,621.28 = 5,167.18 : x
2. Step 2: Convert to fraction form
   9,146.31/12,621.28 = 5,167.18/x
3. Step 3: Cross multiply
   9,146.31x = 12,621.28 × 5,167.18
4. Step 4: Simplify right side
   9,146.31x = 65,216,425.59
5. Step 5: Solve for x
   x = 65,216,425.59/9,146.31
6. Step 6: Final answer
   x = 7,130.35