Finding the Third Proportional to 89,987 and 139,697.50

Step by Step Solution

1. Step 1: Write the proportion equation
   89,987 : 139,697.50 = 139,697.50 : x
2. Step 2: Convert to fraction form
   89,987/139,697.50 = 139,697.50/x
3. Step 3: Cross multiply
   89,987x = 139,697.50 × 139,697.50
4. Step 4: Simplify right side
   89,987x = 19,515,391,506.25
5. Step 5: Solve for x
   x = 19,515,391,506.25/89,987
6. Step 6: Final answer
   x = 216,869.01