Finding the Third Proportional to 518,117.50 and 789,711

Step by Step Solution

1. Step 1: Write the proportion equation
   518,117.50 : 789,711 = 789,711 : x
2. Step 2: Convert to fraction form
   518,117.50/789,711 = 789,711/x
3. Step 3: Cross multiply
   518,117.50x = 789,711 × 789,711
4. Step 4: Simplify right side
   518,117.50x = 623,643,463,521
5. Step 5: Solve for x
   x = 623,643,463,521/518,117.50
6. Step 6: Final answer
   x = 1,203,671.88