Finding the Fourth Proportional to 1,290,498.72, 1,780,851.60 and 717,528.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290,498.72 : 1,780,851.60 = 717,528.48 : x
2. Step 2: Convert to fraction form
   1,290,498.72/1,780,851.60 = 717,528.48/x
3. Step 3: Cross multiply
   1,290,498.72x = 1,780,851.60 × 717,528.48
4. Step 4: Simplify right side
   1,290,498.72x = 1,277,811,741,653.57
5. Step 5: Solve for x
   x = 1,277,811,741,653.57/1,290,498.72
6. Step 6: Final answer
   x = 990,168.93