Finding the Third Proportional to 90,486 and 140,899

Step by Step Solution

1. Step 1: Write the proportion equation
   90,486 : 140,899 = 140,899 : x
2. Step 2: Convert to fraction form
   90,486/140,899 = 140,899/x
3. Step 3: Cross multiply
   90,486x = 140,899 × 140,899
4. Step 4: Simplify right side
   90,486x = 19,852,528,201
5. Step 5: Solve for x
   x = 19,852,528,201/90,486
6. Step 6: Final answer
   x = 219,398.89