Finding the Fourth Proportional to 2,007.36, 3,012.72 and 853.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,007.36 : 3,012.72 = 853.92 : x
2. Step 2: Convert to fraction form
   2,007.36/3,012.72 = 853.92/x
3. Step 3: Cross multiply
   2,007.36x = 3,012.72 × 853.92
4. Step 4: Simplify right side
   2,007.36x = 2,572,621.86
5. Step 5: Solve for x
   x = 2,572,621.86/2,007.36
6. Step 6: Final answer
   x = 1,281.59