Finding the Third Proportional to 82,426 and 177,990

Step by Step Solution

1. Step 1: Write the proportion equation
   82,426 : 177,990 = 177,990 : x
2. Step 2: Convert to fraction form
   82,426/177,990 = 177,990/x
3. Step 3: Cross multiply
   82,426x = 177,990 × 177,990
4. Step 4: Simplify right side
   82,426x = 31,680,440,100
5. Step 5: Solve for x
   x = 31,680,440,100/82,426
6. Step 6: Final answer
   x = 384,350.08