Finding the Third Proportional to 550,911 and 842,665.50

Step by Step Solution

1. Step 1: Write the proportion equation
   550,911 : 842,665.50 = 842,665.50 : x
2. Step 2: Convert to fraction form
   550,911/842,665.50 = 842,665.50/x
3. Step 3: Cross multiply
   550,911x = 842,665.50 × 842,665.50
4. Step 4: Simplify right side
   550,911x = 710,085,144,890.25
5. Step 5: Solve for x
   x = 710,085,144,890.25/550,911
6. Step 6: Final answer
   x = 1,288,928.96