Finding the Third Proportional to 90,774 and 139,987.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,774 : 139,987.50 = 139,987.50 : x
2. Step 2: Convert to fraction form
   90,774/139,987.50 = 139,987.50/x
3. Step 3: Cross multiply
   90,774x = 139,987.50 × 139,987.50
4. Step 4: Simplify right side
   90,774x = 19,596,500,156.25
5. Step 5: Solve for x
   x = 19,596,500,156.25/90,774
6. Step 6: Final answer
   x = 215,882.30