Finding the Third Proportional to 31,990 and 69,724

Step by Step Solution

1. Step 1: Write the proportion equation
   31,990 : 69,724 = 69,724 : x
2. Step 2: Convert to fraction form
   31,990/69,724 = 69,724/x
3. Step 3: Cross multiply
   31,990x = 69,724 × 69,724
4. Step 4: Simplify right side
   31,990x = 4,861,436,176
5. Step 5: Solve for x
   x = 4,861,436,176/31,990
6. Step 6: Final answer
   x = 151,967.37