Finding the Third Proportional to 390,525 and 812,149.50

Step by Step Solution

1. Step 1: Write the proportion equation
   390,525 : 812,149.50 = 812,149.50 : x
2. Step 2: Convert to fraction form
   390,525/812,149.50 = 812,149.50/x
3. Step 3: Cross multiply
   390,525x = 812,149.50 × 812,149.50
4. Step 4: Simplify right side
   390,525x = 659,586,810,350.25
5. Step 5: Solve for x
   x = 659,586,810,350.25/390,525
6. Step 6: Final answer
   x = 1,688,974.61