Finding the Third Proportional to 65,987 and 89,651.50

Step by Step Solution

1. Step 1: Write the proportion equation
   65,987 : 89,651.50 = 89,651.50 : x
2. Step 2: Convert to fraction form
   65,987/89,651.50 = 89,651.50/x
3. Step 3: Cross multiply
   65,987x = 89,651.50 × 89,651.50
4. Step 4: Simplify right side
   65,987x = 8,037,391,452.25
5. Step 5: Solve for x
   x = 8,037,391,452.25/65,987
6. Step 6: Final answer
   x = 121,802.65