Finding the Third Proportional to 90,879.75 and 139,500

Step by Step Solution

1. Step 1: Write the proportion equation
   90,879.75 : 139,500 = 139,500 : x
2. Step 2: Convert to fraction form
   90,879.75/139,500 = 139,500/x
3. Step 3: Cross multiply
   90,879.75x = 139,500 × 139,500
4. Step 4: Simplify right side
   90,879.75x = 19,460,250,000
5. Step 5: Solve for x
   x = 19,460,250,000/90,879.75
6. Step 6: Final answer
   x = 214,131.86