Finding the Third Proportional to 640,784 and 1,364,390

Step by Step Solution

1. Step 1: Write the proportion equation
   640,784 : 1,364,390 = 1,364,390 : x
2. Step 2: Convert to fraction form
   640,784/1,364,390 = 1,364,390/x
3. Step 3: Cross multiply
   640,784x = 1,364,390 × 1,364,390
4. Step 4: Simplify right side
   640,784x = 1,861,560,072,100
5. Step 5: Solve for x
   x = 1,861,560,072,100/640,784
6. Step 6: Final answer
   x = 2,905,128.83