Finding the Fourth Proportional to 13,103.78, 18,080.01 and 7,726.59

Step by Step Solution

1. Step 1: Write the proportion equation
   13,103.78 : 18,080.01 = 7,726.59 : x
2. Step 2: Convert to fraction form
   13,103.78/18,080.01 = 7,726.59/x
3. Step 3: Cross multiply
   13,103.78x = 18,080.01 × 7,726.59
4. Step 4: Simplify right side
   13,103.78x = 139,696,824.47
5. Step 5: Solve for x
   x = 139,696,824.47/13,103.78
6. Step 6: Final answer
   x = 10,660.81