Finding the Third Proportional to 63,780.75 and 139,216.50

Step by Step Solution

1. Step 1: Write the proportion equation
   63,780.75 : 139,216.50 = 139,216.50 : x
2. Step 2: Convert to fraction form
   63,780.75/139,216.50 = 139,216.50/x
3. Step 3: Cross multiply
   63,780.75x = 139,216.50 × 139,216.50
4. Step 4: Simplify right side
   63,780.75x = 19,381,233,872.25
5. Step 5: Solve for x
   x = 19,381,233,872.25/63,780.75
6. Step 6: Final answer
   x = 303,872.78