Finding the Third Proportional to 172,638 and 369,256.50

Step by Step Solution

1. Step 1: Write the proportion equation
   172,638 : 369,256.50 = 369,256.50 : x
2. Step 2: Convert to fraction form
   172,638/369,256.50 = 369,256.50/x
3. Step 3: Cross multiply
   172,638x = 369,256.50 × 369,256.50
4. Step 4: Simplify right side
   172,638x = 136,350,362,792.25
5. Step 5: Solve for x
   x = 136,350,362,792.25/172,638
6. Step 6: Final answer
   x = 789,805.04