Finding the Fourth Proportional to 12,726.36, 17,562.38 and 7,420.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,726.36 : 17,562.38 = 7,420.15 : x
2. Step 2: Convert to fraction form
   12,726.36/17,562.38 = 7,420.15/x
3. Step 3: Cross multiply
   12,726.36x = 17,562.38 × 7,420.15
4. Step 4: Simplify right side
   12,726.36x = 130,315,456.86
5. Step 5: Solve for x
   x = 130,315,456.86/12,726.36
6. Step 6: Final answer
   x = 10,239.81