Finding the Third Proportional to 392,430 and 831,553.50

Step by Step Solution

1. Step 1: Write the proportion equation
   392,430 : 831,553.50 = 831,553.50 : x
2. Step 2: Convert to fraction form
   392,430/831,553.50 = 831,553.50/x
3. Step 3: Cross multiply
   392,430x = 831,553.50 × 831,553.50
4. Step 4: Simplify right side
   392,430x = 691,481,223,362.25
5. Step 5: Solve for x
   x = 691,481,223,362.25/392,430
6. Step 6: Final answer
   x = 1,762,049.85