Finding the Fourth Proportional to 13,726.80, 18,943 and 7,439.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,726.80 : 18,943 = 7,439.12 : x
2. Step 2: Convert to fraction form
   13,726.80/18,943 = 7,439.12/x
3. Step 3: Cross multiply
   13,726.80x = 18,943 × 7,439.12
4. Step 4: Simplify right side
   13,726.80x = 140,919,250.16
5. Step 5: Solve for x
   x = 140,919,250.16/13,726.80
6. Step 6: Final answer
   x = 10,265.99