Finding the Third Proportional to 640,772 and 1,364,368

Step by Step Solution

1. Step 1: Write the proportion equation
   640,772 : 1,364,368 = 1,364,368 : x
2. Step 2: Convert to fraction form
   640,772/1,364,368 = 1,364,368/x
3. Step 3: Cross multiply
   640,772x = 1,364,368 × 1,364,368
4. Step 4: Simplify right side
   640,772x = 1,861,500,039,424
5. Step 5: Solve for x
   x = 1,861,500,039,424/640,772
6. Step 6: Final answer
   x = 2,905,089.55