Finding the Fourth Proportional to 12,485.55, 17,221.89 and 8,002.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,485.55 : 17,221.89 = 8,002.20 : x
2. Step 2: Convert to fraction form
   12,485.55/17,221.89 = 8,002.20/x
3. Step 3: Cross multiply
   12,485.55x = 17,221.89 × 8,002.20
4. Step 4: Simplify right side
   12,485.55x = 137,813,008.16
5. Step 5: Solve for x
   x = 137,813,008.16/12,485.55
6. Step 6: Final answer
   x = 11,037.80