Finding the Third Proportional to 336,640 and 724,144

Step by Step Solution

1. Step 1: Write the proportion equation
   336,640 : 724,144 = 724,144 : x
2. Step 2: Convert to fraction form
   336,640/724,144 = 724,144/x
3. Step 3: Cross multiply
   336,640x = 724,144 × 724,144
4. Step 4: Simplify right side
   336,640x = 524,384,532,736
5. Step 5: Solve for x
   x = 524,384,532,736/336,640
6. Step 6: Final answer
   x = 1,557,701.20