Finding the Third Proportional to 162,916 and 345,128

Step by Step Solution

1. Step 1: Write the proportion equation
   162,916 : 345,128 = 345,128 : x
2. Step 2: Convert to fraction form
   162,916/345,128 = 345,128/x
3. Step 3: Cross multiply
   162,916x = 345,128 × 345,128
4. Step 4: Simplify right side
   162,916x = 119,113,336,384
5. Step 5: Solve for x
   x = 119,113,336,384/162,916
6. Step 6: Final answer
   x = 731,133.45