Finding the Third Proportional to 288,076.50 and 618,799.50

Step by Step Solution

1. Step 1: Write the proportion equation
   288,076.50 : 618,799.50 = 618,799.50 : x
2. Step 2: Convert to fraction form
   288,076.50/618,799.50 = 618,799.50/x
3. Step 3: Cross multiply
   288,076.50x = 618,799.50 × 618,799.50
4. Step 4: Simplify right side
   288,076.50x = 382,912,821,200.25
5. Step 5: Solve for x
   x = 382,912,821,200.25/288,076.50
6. Step 6: Final answer
   x = 1,329,205.34