Finding the Fourth Proportional to 12,661.72, 17,474.60 and 7,626.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,661.72 : 17,474.60 = 7,626.20 : x
2. Step 2: Convert to fraction form
   12,661.72/17,474.60 = 7,626.20/x
3. Step 3: Cross multiply
   12,661.72x = 17,474.60 × 7,626.20
4. Step 4: Simplify right side
   12,661.72x = 133,264,794.52
5. Step 5: Solve for x
   x = 133,264,794.52/12,661.72
6. Step 6: Final answer
   x = 10,525.02