Finding the Third Proportional to 690,768 and 918,144

Step by Step Solution

1. Step 1: Write the proportion equation
   690,768 : 918,144 = 918,144 : x
2. Step 2: Convert to fraction form
   690,768/918,144 = 918,144/x
3. Step 3: Cross multiply
   690,768x = 918,144 × 918,144
4. Step 4: Simplify right side
   690,768x = 842,988,404,736
5. Step 5: Solve for x
   x = 842,988,404,736/690,768
6. Step 6: Final answer
   x = 1,220,364.01