Finding the Third Proportional to 156,974 and 322,290

Step by Step Solution

1. Step 1: Write the proportion equation
   156,974 : 322,290 = 322,290 : x
2. Step 2: Convert to fraction form
   156,974/322,290 = 322,290/x
3. Step 3: Cross multiply
   156,974x = 322,290 × 322,290
4. Step 4: Simplify right side
   156,974x = 103,870,844,100
5. Step 5: Solve for x
   x = 103,870,844,100/156,974
6. Step 6: Final answer
   x = 661,707.32