Finding the Third Proportional to 65,778.75 and 143,086.50

Step by Step Solution

1. Step 1: Write the proportion equation
   65,778.75 : 143,086.50 = 143,086.50 : x
2. Step 2: Convert to fraction form
   65,778.75/143,086.50 = 143,086.50/x
3. Step 3: Cross multiply
   65,778.75x = 143,086.50 × 143,086.50
4. Step 4: Simplify right side
   65,778.75x = 20,473,746,482.25
5. Step 5: Solve for x
   x = 20,473,746,482.25/65,778.75
6. Step 6: Final answer
   x = 311,251.68