Finding the Fourth Proportional to 13,726.72, 18,942.86 and 7,439.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,726.72 : 18,942.86 = 7,439.10 : x
2. Step 2: Convert to fraction form
   13,726.72/18,942.86 = 7,439.10/x
3. Step 3: Cross multiply
   13,726.72x = 18,942.86 × 7,439.10
4. Step 4: Simplify right side
   13,726.72x = 140,917,829.83
5. Step 5: Solve for x
   x = 140,917,829.83/13,726.72
6. Step 6: Final answer
   x = 10,265.95