Finding the Third Proportional to 65,638.50 and 143,987.25

Step by Step Solution

1. Step 1: Write the proportion equation
   65,638.50 : 143,987.25 = 143,987.25 : x
2. Step 2: Convert to fraction form
   65,638.50/143,987.25 = 143,987.25/x
3. Step 3: Cross multiply
   65,638.50x = 143,987.25 × 143,987.25
4. Step 4: Simplify right side
   65,638.50x = 20,732,328,162.56
5. Step 5: Solve for x
   x = 20,732,328,162.56/65,638.50
6. Step 6: Final answer
   x = 315,856.21