Finding the Third Proportional to 156,931 and 322,123

Step by Step Solution

1. Step 1: Write the proportion equation
   156,931 : 322,123 = 322,123 : x
2. Step 2: Convert to fraction form
   156,931/322,123 = 322,123/x
3. Step 3: Cross multiply
   156,931x = 322,123 × 322,123
4. Step 4: Simplify right side
   156,931x = 103,763,227,129
5. Step 5: Solve for x
   x = 103,763,227,129/156,931
6. Step 6: Final answer
   x = 661,202.87