Finding the Third Proportional to 90,874.50 and 139,486.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,874.50 : 139,486.50 = 139,486.50 : x
2. Step 2: Convert to fraction form
   90,874.50/139,486.50 = 139,486.50/x
3. Step 3: Cross multiply
   90,874.50x = 139,486.50 × 139,486.50
4. Step 4: Simplify right side
   90,874.50x = 19,456,483,682.25
5. Step 5: Solve for x
   x = 19,456,483,682.25/90,874.50
6. Step 6: Final answer
   x = 214,102.79