Finding the Third Proportional to 63,990 and 139,626

Step by Step Solution

1. Step 1: Write the proportion equation
   63,990 : 139,626 = 139,626 : x
2. Step 2: Convert to fraction form
   63,990/139,626 = 139,626/x
3. Step 3: Cross multiply
   63,990x = 139,626 × 139,626
4. Step 4: Simplify right side
   63,990x = 19,495,419,876
5. Step 5: Solve for x
   x = 19,495,419,876/63,990
6. Step 6: Final answer
   x = 304,663.54