Finding the Fourth Proportional to 9,152.90, 12,631.79 and 5,174.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,152.90 : 12,631.79 = 5,174.72 : x
2. Step 2: Convert to fraction form
   9,152.90/12,631.79 = 5,174.72/x
3. Step 3: Cross multiply
   9,152.90x = 12,631.79 × 5,174.72
4. Step 4: Simplify right side
   9,152.90x = 65,365,950.48
5. Step 5: Solve for x
   x = 65,365,950.48/9,152.90
6. Step 6: Final answer
   x = 7,141.56