Finding the Third Proportional to 8,772 and 13,116.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,772 : 13,116.50 = 13,116.50 : x
2. Step 2: Convert to fraction form
   8,772/13,116.50 = 13,116.50/x
3. Step 3: Cross multiply
   8,772x = 13,116.50 × 13,116.50
4. Step 4: Simplify right side
   8,772x = 172,042,572.25
5. Step 5: Solve for x
   x = 172,042,572.25/8,772
6. Step 6: Final answer
   x = 19,612.70