Finding the Fourth Proportional to 12,900.88, 17,807.00 and 8,425.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,900.88 : 17,807.00 = 8,425.31 : x
2. Step 2: Convert to fraction form
   12,900.88/17,807.00 = 8,425.31/x
3. Step 3: Cross multiply
   12,900.88x = 17,807.00 × 8,425.31
4. Step 4: Simplify right side
   12,900.88x = 150,029,364.01
5. Step 5: Solve for x
   x = 150,029,364.01/12,900.88
6. Step 6: Final answer
   x = 11,629.39