Finding the Third Proportional to 8,641.69 and 18,478.13

Step by Step Solution

1. Step 1: Write the proportion equation
   8,641.69 : 18,478.13 = 18,478.13 : x
2. Step 2: Convert to fraction form
   8,641.69/18,478.13 = 18,478.13/x
3. Step 3: Cross multiply
   8,641.69x = 18,478.13 × 18,478.13
4. Step 4: Simplify right side
   8,641.69x = 341,441,103.52
5. Step 5: Solve for x
   x = 341,441,103.52/8,641.69
6. Step 6: Final answer
   x = 39,510.93