Finding the Fourth Proportional to 13,387.85, 18,477.82 and 7,726.25

Step by Step Solution

1. Step 1: Write the proportion equation
   13,387.85 : 18,477.82 = 7,726.25 : x
2. Step 2: Convert to fraction form
   13,387.85/18,477.82 = 7,726.25/x
3. Step 3: Cross multiply
   13,387.85x = 18,477.82 × 7,726.25
4. Step 4: Simplify right side
   13,387.85x = 142,764,256.78
5. Step 5: Solve for x
   x = 142,764,256.78/13,387.85
6. Step 6: Final answer
   x = 10,663.72