Finding the Third Proportional to 427,689 and 662,161.50

Step by Step Solution

1. Step 1: Write the proportion equation
   427,689 : 662,161.50 = 662,161.50 : x
2. Step 2: Convert to fraction form
   427,689/662,161.50 = 662,161.50/x
3. Step 3: Cross multiply
   427,689x = 662,161.50 × 662,161.50
4. Step 4: Simplify right side
   427,689x = 438,457,852,082.25
5. Step 5: Solve for x
   x = 438,457,852,082.25/427,689
6. Step 6: Final answer
   x = 1,025,179.17