Finding the Third Proportional to 300,771.50 and 668,790

Step by Step Solution

1. Step 1: Write the proportion equation
   300,771.50 : 668,790 = 668,790 : x
2. Step 2: Convert to fraction form
   300,771.50/668,790 = 668,790/x
3. Step 3: Cross multiply
   300,771.50x = 668,790 × 668,790
4. Step 4: Simplify right side
   300,771.50x = 447,280,064,100
5. Step 5: Solve for x
   x = 447,280,064,100/300,771.50
6. Step 6: Final answer
   x = 1,487,109.20