Finding the Third Proportional to 15,581.50 and 21,863.50

Step by Step Solution

1. Step 1: Write the proportion equation
   15,581.50 : 21,863.50 = 21,863.50 : x
2. Step 2: Convert to fraction form
   15,581.50/21,863.50 = 21,863.50/x
3. Step 3: Cross multiply
   15,581.50x = 21,863.50 × 21,863.50
4. Step 4: Simplify right side
   15,581.50x = 478,012,632.25
5. Step 5: Solve for x
   x = 478,012,632.25/15,581.50
6. Step 6: Final answer
   x = 30,678.22