Finding the Fourth Proportional to 13,105.48, 18,081.45 and 7,439.80

Step by Step Solution

1. Step 1: Write the proportion equation
   13,105.48 : 18,081.45 = 7,439.80 : x
2. Step 2: Convert to fraction form
   13,105.48/18,081.45 = 7,439.80/x
3. Step 3: Cross multiply
   13,105.48x = 18,081.45 × 7,439.80
4. Step 4: Simplify right side
   13,105.48x = 134,522,371.71
5. Step 5: Solve for x
   x = 134,522,371.71/13,105.48
6. Step 6: Final answer
   x = 10,264.59