Finding the Third Proportional to 690,398 and 1,428,726

Step by Step Solution

1. Step 1: Write the proportion equation
   690,398 : 1,428,726 = 1,428,726 : x
2. Step 2: Convert to fraction form
   690,398/1,428,726 = 1,428,726/x
3. Step 3: Cross multiply
   690,398x = 1,428,726 × 1,428,726
4. Step 4: Simplify right side
   690,398x = 2,041,257,983,076
5. Step 5: Solve for x
   x = 2,041,257,983,076/690,398
6. Step 6: Final answer
   x = 2,956,639.48