Finding the Fourth Proportional to 9,153.17, 12,631.30 and 5,174.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,153.17 : 12,631.30 = 5,174.28 : x
2. Step 2: Convert to fraction form
   9,153.17/12,631.30 = 5,174.28/x
3. Step 3: Cross multiply
   9,153.17x = 12,631.30 × 5,174.28
4. Step 4: Simplify right side
   9,153.17x = 65,357,851.39
5. Step 5: Solve for x
   x = 65,357,851.39/9,153.17
6. Step 6: Final answer
   x = 7,140.46