Finding the Fourth Proportional to 9,147.72, 12,623.80 and 5,170.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,147.72 : 12,623.80 = 5,170.12 : x
2. Step 2: Convert to fraction form
   9,147.72/12,623.80 = 5,170.12/x
3. Step 3: Cross multiply
   9,147.72x = 12,623.80 × 5,170.12
4. Step 4: Simplify right side
   9,147.72x = 65,266,560.86
5. Step 5: Solve for x
   x = 65,266,560.86/9,147.72
6. Step 6: Final answer
   x = 7,134.74