Finding the Third Proportional to 603,417 and 831,210.75

Step by Step Solution

1. Step 1: Write the proportion equation
   603,417 : 831,210.75 = 831,210.75 : x
2. Step 2: Convert to fraction form
   603,417/831,210.75 = 831,210.75/x
3. Step 3: Cross multiply
   603,417x = 831,210.75 × 831,210.75
4. Step 4: Simplify right side
   603,417x = 690,911,310,915.56
5. Step 5: Solve for x
   x = 690,911,310,915.56/603,417
6. Step 6: Final answer
   x = 1,144,998.09