Finding the Fourth Proportional to 12,449.61, 17,180.28 and 7,145.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,449.61 : 17,180.28 = 7,145.55 : x
2. Step 2: Convert to fraction form
   12,449.61/17,180.28 = 7,145.55/x
3. Step 3: Cross multiply
   12,449.61x = 17,180.28 × 7,145.55
4. Step 4: Simplify right side
   12,449.61x = 122,762,549.75
5. Step 5: Solve for x
   x = 122,762,549.75/12,449.61
6. Step 6: Final answer
   x = 9,860.75