Finding the Fourth Proportional to 13,391.94, 18,476.28 and 7,726.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,391.94 : 18,476.28 = 7,726.50 : x
2. Step 2: Convert to fraction form
   13,391.94/18,476.28 = 7,726.50/x
3. Step 3: Cross multiply
   13,391.94x = 18,476.28 × 7,726.50
4. Step 4: Simplify right side
   13,391.94x = 142,756,977.42
5. Step 5: Solve for x
   x = 142,756,977.42/13,391.94
6. Step 6: Final answer
   x = 10,659.92