Finding the Third Proportional to 329,640 and 674,940

Step by Step Solution

1. Step 1: Write the proportion equation
   329,640 : 674,940 = 674,940 : x
2. Step 2: Convert to fraction form
   329,640/674,940 = 674,940/x
3. Step 3: Cross multiply
   329,640x = 674,940 × 674,940
4. Step 4: Simplify right side
   329,640x = 455,544,003,600
5. Step 5: Solve for x
   x = 455,544,003,600/329,640
6. Step 6: Final answer
   x = 1,381,943.95