Finding the Third Proportional to 275,218 and 387,566.50

Step by Step Solution

1. Step 1: Write the proportion equation
   275,218 : 387,566.50 = 387,566.50 : x
2. Step 2: Convert to fraction form
   275,218/387,566.50 = 387,566.50/x
3. Step 3: Cross multiply
   275,218x = 387,566.50 × 387,566.50
4. Step 4: Simplify right side
   275,218x = 150,207,791,922.25
5. Step 5: Solve for x
   x = 150,207,791,922.25/275,218
6. Step 6: Final answer
   x = 545,777.50