Finding the Third Proportional to 391,974.56 and 831,049.31

Step by Step Solution

1. Step 1: Write the proportion equation
   391,974.56 : 831,049.31 = 831,049.31 : x
2. Step 2: Convert to fraction form
   391,974.56/831,049.31 = 831,049.31/x
3. Step 3: Cross multiply
   391,974.56x = 831,049.31 × 831,049.31
4. Step 4: Simplify right side
   391,974.56x = 690,642,959,806.72
5. Step 5: Solve for x
   x = 690,642,959,806.72/391,974.56
6. Step 6: Final answer
   x = 1,761,958.62