Finding the Fourth Proportional to 1,290,488.43, 1,780,863.24 and 717,523.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290,488.43 : 1,780,863.24 = 717,523.59 : x
2. Step 2: Convert to fraction form
   1,290,488.43/1,780,863.24 = 717,523.59/x
3. Step 3: Cross multiply
   1,290,488.43x = 1,780,863.24 × 717,523.59
4. Step 4: Simplify right side
   1,290,488.43x = 1,277,811,394,632.78
5. Step 5: Solve for x
   x = 1,277,811,394,632.78/1,290,488.43
6. Step 6: Final answer
   x = 990,176.56