Finding the Fourth Proportional to 2,591.94, 3,886.08 and 836.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,591.94 : 3,886.08 = 836.40 : x
2. Step 2: Convert to fraction form
   2,591.94/3,886.08 = 836.40/x
3. Step 3: Cross multiply
   2,591.94x = 3,886.08 × 836.40
4. Step 4: Simplify right side
   2,591.94x = 3,250,317.31
5. Step 5: Solve for x
   x = 3,250,317.31/2,591.94
6. Step 6: Final answer
   x = 1,254.01