Finding the Third Proportional to 287,617.50 and 619,380

Step by Step Solution

1. Step 1: Write the proportion equation
   287,617.50 : 619,380 = 619,380 : x
2. Step 2: Convert to fraction form
   287,617.50/619,380 = 619,380/x
3. Step 3: Cross multiply
   287,617.50x = 619,380 × 619,380
4. Step 4: Simplify right side
   287,617.50x = 383,631,584,400
5. Step 5: Solve for x
   x = 383,631,584,400/287,617.50
6. Step 6: Final answer
   x = 1,333,825.60