Finding the Third Proportional to 156,972 and 322,210

Step by Step Solution

1. Step 1: Write the proportion equation
   156,972 : 322,210 = 322,210 : x
2. Step 2: Convert to fraction form
   156,972/322,210 = 322,210/x
3. Step 3: Cross multiply
   156,972x = 322,210 × 322,210
4. Step 4: Simplify right side
   156,972x = 103,819,284,100
5. Step 5: Solve for x
   x = 103,819,284,100/156,972
6. Step 6: Final answer
   x = 661,387.28