Finding the Third Proportional to 550,981.50 and 851,406

Step by Step Solution

1. Step 1: Write the proportion equation
   550,981.50 : 851,406 = 851,406 : x
2. Step 2: Convert to fraction form
   550,981.50/851,406 = 851,406/x
3. Step 3: Cross multiply
   550,981.50x = 851,406 × 851,406
4. Step 4: Simplify right side
   550,981.50x = 724,892,176,836
5. Step 5: Solve for x
   x = 724,892,176,836/550,981.50
6. Step 6: Final answer
   x = 1,315,637.96