Finding the Fourth Proportional to 2,591.29, 3,886.38 and 836.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,591.29 : 3,886.38 = 836.45 : x
2. Step 2: Convert to fraction form
   2,591.29/3,886.38 = 836.45/x
3. Step 3: Cross multiply
   2,591.29x = 3,886.38 × 836.45
4. Step 4: Simplify right side
   2,591.29x = 3,250,762.55
5. Step 5: Solve for x
   x = 3,250,762.55/2,591.29
6. Step 6: Final answer
   x = 1,254.50