Finding the Third Proportional to 156,987 and 339,123

Step by Step Solution

1. Step 1: Write the proportion equation
   156,987 : 339,123 = 339,123 : x
2. Step 2: Convert to fraction form
   156,987/339,123 = 339,123/x
3. Step 3: Cross multiply
   156,987x = 339,123 × 339,123
4. Step 4: Simplify right side
   156,987x = 115,004,409,129
5. Step 5: Solve for x
   x = 115,004,409,129/156,987
6. Step 6: Final answer
   x = 732,572.82