Finding the Fourth Proportional to 13,105.32, 18,085.51 and 7,439.64

Step by Step Solution

1. Step 1: Write the proportion equation
   13,105.32 : 18,085.51 = 7,439.64 : x
2. Step 2: Convert to fraction form
   13,105.32/18,085.51 = 7,439.64/x
3. Step 3: Cross multiply
   13,105.32x = 18,085.51 × 7,439.64
4. Step 4: Simplify right side
   13,105.32x = 134,549,683.62
5. Step 5: Solve for x
   x = 134,549,683.62/13,105.32
6. Step 6: Final answer
   x = 10,266.80