Finding the Third Proportional to 8,815.50 and 13,678.88

Step by Step Solution

1. Step 1: Write the proportion equation
   8,815.50 : 13,678.88 = 13,678.88 : x
2. Step 2: Convert to fraction form
   8,815.50/13,678.88 = 13,678.88/x
3. Step 3: Cross multiply
   8,815.50x = 13,678.88 × 13,678.88
4. Step 4: Simplify right side
   8,815.50x = 187,111,621.27
5. Step 5: Solve for x
   x = 187,111,621.27/8,815.50
6. Step 6: Final answer
   x = 21,225.30