Finding the Third Proportional to 275,364 and 387,778.50

Step by Step Solution

1. Step 1: Write the proportion equation
   275,364 : 387,778.50 = 387,778.50 : x
2. Step 2: Convert to fraction form
   275,364/387,778.50 = 387,778.50/x
3. Step 3: Cross multiply
   275,364x = 387,778.50 × 387,778.50
4. Step 4: Simplify right side
   275,364x = 150,372,165,062.25
5. Step 5: Solve for x
   x = 150,372,165,062.25/275,364
6. Step 6: Final answer
   x = 546,085.05