Finding the Third Proportional to 63,431.50 and 139,418

Step by Step Solution

1. Step 1: Write the proportion equation
   63,431.50 : 139,418 = 139,418 : x
2. Step 2: Convert to fraction form
   63,431.50/139,418 = 139,418/x
3. Step 3: Cross multiply
   63,431.50x = 139,418 × 139,418
4. Step 4: Simplify right side
   63,431.50x = 19,437,378,724
5. Step 5: Solve for x
   x = 19,437,378,724/63,431.50
6. Step 6: Final answer
   x = 306,431.01