Finding the Fourth Proportional to 2,591.68, 3,887.78 and 836.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,591.68 : 3,887.78 = 836.23 : x
2. Step 2: Convert to fraction form
   2,591.68/3,887.78 = 836.23/x
3. Step 3: Cross multiply
   2,591.68x = 3,887.78 × 836.23
4. Step 4: Simplify right side
   2,591.68x = 3,251,078.27
5. Step 5: Solve for x
   x = 3,251,078.27/2,591.68
6. Step 6: Final answer
   x = 1,254.43