Finding the Third Proportional to 660,555 and 919,120.50

Step by Step Solution

1. Step 1: Write the proportion equation
   660,555 : 919,120.50 = 919,120.50 : x
2. Step 2: Convert to fraction form
   660,555/919,120.50 = 919,120.50/x
3. Step 3: Cross multiply
   660,555x = 919,120.50 × 919,120.50
4. Step 4: Simplify right side
   660,555x = 844,782,493,520.25
5. Step 5: Solve for x
   x = 844,782,493,520.25/660,555
6. Step 6: Final answer
   x = 1,278,898.04