Finding the Third Proportional to 90,690 and 142,990

Step by Step Solution

1. Step 1: Write the proportion equation
   90,690 : 142,990 = 142,990 : x
2. Step 2: Convert to fraction form
   90,690/142,990 = 142,990/x
3. Step 3: Cross multiply
   90,690x = 142,990 × 142,990
4. Step 4: Simplify right side
   90,690x = 20,446,140,100
5. Step 5: Solve for x
   x = 20,446,140,100/90,690
6. Step 6: Final answer
   x = 225,450.88