Finding the Fourth Proportional to 12,443.55, 17,148.47 and 8,900.61

Step by Step Solution

1. Step 1: Write the proportion equation
   12,443.55 : 17,148.47 = 8,900.61 : x
2. Step 2: Convert to fraction form
   12,443.55/17,148.47 = 8,900.61/x
3. Step 3: Cross multiply
   12,443.55x = 17,148.47 × 8,900.61
4. Step 4: Simplify right side
   12,443.55x = 152,631,843.57
5. Step 5: Solve for x
   x = 152,631,843.57/12,443.55
6. Step 6: Final answer
   x = 12,265.94