Finding the Third Proportional to 8,387.30 and 12,563.86

Step by Step Solution

1. Step 1: Write the proportion equation
   8,387.30 : 12,563.86 = 12,563.86 : x
2. Step 2: Convert to fraction form
   8,387.30/12,563.86 = 12,563.86/x
3. Step 3: Cross multiply
   8,387.30x = 12,563.86 × 12,563.86
4. Step 4: Simplify right side
   8,387.30x = 157,850,562.39
5. Step 5: Solve for x
   x = 157,850,562.39/8,387.30
6. Step 6: Final answer
   x = 18,820.19