Finding the Third Proportional to 31,808 and 67,990

Step by Step Solution

1. Step 1: Write the proportion equation
   31,808 : 67,990 = 67,990 : x
2. Step 2: Convert to fraction form
   31,808/67,990 = 67,990/x
3. Step 3: Cross multiply
   31,808x = 67,990 × 67,990
4. Step 4: Simplify right side
   31,808x = 4,622,640,100
5. Step 5: Solve for x
   x = 4,622,640,100/31,808
6. Step 6: Final answer
   x = 145,329.48