Finding the Third Proportional to 8,491.50 and 13,115.25

Step by Step Solution

1. Step 1: Write the proportion equation
   8,491.50 : 13,115.25 = 13,115.25 : x
2. Step 2: Convert to fraction form
   8,491.50/13,115.25 = 13,115.25/x
3. Step 3: Cross multiply
   8,491.50x = 13,115.25 × 13,115.25
4. Step 4: Simplify right side
   8,491.50x = 172,009,782.56
5. Step 5: Solve for x
   x = 172,009,782.56/8,491.50
6. Step 6: Final answer
   x = 20,256.70