Finding the Third Proportional to 143,248.50 and 307,638

Step by Step Solution

1. Step 1: Write the proportion equation
   143,248.50 : 307,638 = 307,638 : x
2. Step 2: Convert to fraction form
   143,248.50/307,638 = 307,638/x
3. Step 3: Cross multiply
   143,248.50x = 307,638 × 307,638
4. Step 4: Simplify right side
   143,248.50x = 94,641,139,044
5. Step 5: Solve for x
   x = 94,641,139,044/143,248.50
6. Step 6: Final answer
   x = 660,678.05