Finding the Third Proportional to 63,990.75 and 139,645.50

Step by Step Solution

1. Step 1: Write the proportion equation
   63,990.75 : 139,645.50 = 139,645.50 : x
2. Step 2: Convert to fraction form
   63,990.75/139,645.50 = 139,645.50/x
3. Step 3: Cross multiply
   63,990.75x = 139,645.50 × 139,645.50
4. Step 4: Simplify right side
   63,990.75x = 19,500,865,670.25
5. Step 5: Solve for x
   x = 19,500,865,670.25/63,990.75
6. Step 6: Final answer
   x = 304,745.07