Finding the Fourth Proportional to 13,392.10, 18,480.78 and 7,726.86

Step by Step Solution

1. Step 1: Write the proportion equation
   13,392.10 : 18,480.78 = 7,726.86 : x
2. Step 2: Convert to fraction form
   13,392.10/18,480.78 = 7,726.86/x
3. Step 3: Cross multiply
   13,392.10x = 18,480.78 × 7,726.86
4. Step 4: Simplify right side
   13,392.10x = 142,798,399.75
5. Step 5: Solve for x
   x = 142,798,399.75/13,392.10
6. Step 6: Final answer
   x = 10,662.88