Finding the Third Proportional to 392,320.50 and 831,720

Step by Step Solution

1. Step 1: Write the proportion equation
   392,320.50 : 831,720 = 831,720 : x
2. Step 2: Convert to fraction form
   392,320.50/831,720 = 831,720/x
3. Step 3: Cross multiply
   392,320.50x = 831,720 × 831,720
4. Step 4: Simplify right side
   392,320.50x = 691,758,158,400
5. Step 5: Solve for x
   x = 691,758,158,400/392,320.50
6. Step 6: Final answer
   x = 1,763,247.54