Finding the Fourth Proportional to 12,407.29, 17,121.78 and 7,029.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,407.29 : 17,121.78 = 7,029.30 : x
2. Step 2: Convert to fraction form
   12,407.29/17,121.78 = 7,029.30/x
3. Step 3: Cross multiply
   12,407.29x = 17,121.78 × 7,029.30
4. Step 4: Simplify right side
   12,407.29x = 120,354,128.15
5. Step 5: Solve for x
   x = 120,354,128.15/12,407.29
6. Step 6: Final answer
   x = 9,700.28