Finding the Fourth Proportional to 2,672.16, 4,007.78 and 723.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,672.16 : 4,007.78 = 723.91 : x
2. Step 2: Convert to fraction form
   2,672.16/4,007.78 = 723.91/x
3. Step 3: Cross multiply
   2,672.16x = 4,007.78 × 723.91
4. Step 4: Simplify right side
   2,672.16x = 2,901,272.02
5. Step 5: Solve for x
   x = 2,901,272.02/2,672.16
6. Step 6: Final answer
   x = 1,085.74