Finding the Third Proportional to 151,564 and 318,840

Step by Step Solution

1. Step 1: Write the proportion equation
   151,564 : 318,840 = 318,840 : x
2. Step 2: Convert to fraction form
   151,564/318,840 = 318,840/x
3. Step 3: Cross multiply
   151,564x = 318,840 × 318,840
4. Step 4: Simplify right side
   151,564x = 101,658,945,600
5. Step 5: Solve for x
   x = 101,658,945,600/151,564
6. Step 6: Final answer
   x = 670,732.80