Finding the Fourth Proportional to 13,726.98, 18,943.38 and 7,758.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,726.98 : 18,943.38 = 7,758.72 : x
2. Step 2: Convert to fraction form
   13,726.98/18,943.38 = 7,758.72/x
3. Step 3: Cross multiply
   13,726.98x = 18,943.38 × 7,758.72
4. Step 4: Simplify right side
   13,726.98x = 146,976,381.27
5. Step 5: Solve for x
   x = 146,976,381.27/13,726.98
6. Step 6: Final answer
   x = 10,707.12