Finding the Third Proportional to 90,400 and 139,974

Step by Step Solution

1. Step 1: Write the proportion equation
   90,400 : 139,974 = 139,974 : x
2. Step 2: Convert to fraction form
   90,400/139,974 = 139,974/x
3. Step 3: Cross multiply
   90,400x = 139,974 × 139,974
4. Step 4: Simplify right side
   90,400x = 19,592,720,676
5. Step 5: Solve for x
   x = 19,592,720,676/90,400
6. Step 6: Final answer
   x = 216,733.64