Finding the Third Proportional to 156,978 and 336,564

Step by Step Solution

1. Step 1: Write the proportion equation
   156,978 : 336,564 = 336,564 : x
2. Step 2: Convert to fraction form
   156,978/336,564 = 336,564/x
3. Step 3: Cross multiply
   156,978x = 336,564 × 336,564
4. Step 4: Simplify right side
   156,978x = 113,275,326,096
5. Step 5: Solve for x
   x = 113,275,326,096/156,978
6. Step 6: Final answer
   x = 721,600.01