Finding the Third Proportional to 11,220.75 and 12,382.31

Step by Step Solution

1. Step 1: Write the proportion equation
   11,220.75 : 12,382.31 = 12,382.31 : x
2. Step 2: Convert to fraction form
   11,220.75/12,382.31 = 12,382.31/x
3. Step 3: Cross multiply
   11,220.75x = 12,382.31 × 12,382.31
4. Step 4: Simplify right side
   11,220.75x = 153,321,662.85
5. Step 5: Solve for x
   x = 153,321,662.85/11,220.75
6. Step 6: Final answer
   x = 13,664.12