Finding the Fourth Proportional to 12,425.30, 17,146.90 and 7,123.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,425.30 : 17,146.90 = 7,123.20 : x
2. Step 2: Convert to fraction form
   12,425.30/17,146.90 = 7,123.20/x
3. Step 3: Cross multiply
   12,425.30x = 17,146.90 × 7,123.20
4. Step 4: Simplify right side
   12,425.30x = 122,140,798.08
5. Step 5: Solve for x
   x = 122,140,798.08/12,425.30
6. Step 6: Final answer
   x = 9,830.01