Finding the Third Proportional to 690,456 and 1,428,828

Step by Step Solution

1. Step 1: Write the proportion equation
   690,456 : 1,428,828 = 1,428,828 : x
2. Step 2: Convert to fraction form
   690,456/1,428,828 = 1,428,828/x
3. Step 3: Cross multiply
   690,456x = 1,428,828 × 1,428,828
4. Step 4: Simplify right side
   690,456x = 2,041,549,453,584
5. Step 5: Solve for x
   x = 2,041,549,453,584/690,456
6. Step 6: Final answer
   x = 2,956,813.26