Finding the Third Proportional to 287,074.50 and 670,521

Step by Step Solution

1. Step 1: Write the proportion equation
   287,074.50 : 670,521 = 670,521 : x
2. Step 2: Convert to fraction form
   287,074.50/670,521 = 670,521/x
3. Step 3: Cross multiply
   287,074.50x = 670,521 × 670,521
4. Step 4: Simplify right side
   287,074.50x = 449,598,411,441
5. Step 5: Solve for x
   x = 449,598,411,441/287,074.50
6. Step 6: Final answer
   x = 1,566,138.45