Finding the Third Proportional to 8,630.30 and 12,945.45

Step by Step Solution

1. Step 1: Write the proportion equation
   8,630.30 : 12,945.45 = 12,945.45 : x
2. Step 2: Convert to fraction form
   8,630.30/12,945.45 = 12,945.45/x
3. Step 3: Cross multiply
   8,630.30x = 12,945.45 × 12,945.45
4. Step 4: Simplify right side
   8,630.30x = 167,584,554.34
5. Step 5: Solve for x
   x = 167,584,554.34/8,630.30
6. Step 6: Final answer
   x = 19,418.17