Finding the Third Proportional to 154,688 and 339,264

Step by Step Solution

1. Step 1: Write the proportion equation
   154,688 : 339,264 = 339,264 : x
2. Step 2: Convert to fraction form
   154,688/339,264 = 339,264/x
3. Step 3: Cross multiply
   154,688x = 339,264 × 339,264
4. Step 4: Simplify right side
   154,688x = 115,100,061,696
5. Step 5: Solve for x
   x = 115,100,061,696/154,688
6. Step 6: Final answer
   x = 744,078.80