Finding the Fourth Proportional to 5,891.36, 8,128.27 and 3,874.19

Step by Step Solution

1. Step 1: Write the proportion equation
   5,891.36 : 8,128.27 = 3,874.19 : x
2. Step 2: Convert to fraction form
   5,891.36/8,128.27 = 3,874.19/x
3. Step 3: Cross multiply
   5,891.36x = 8,128.27 × 3,874.19
4. Step 4: Simplify right side
   5,891.36x = 31,490,494.60
5. Step 5: Solve for x
   x = 31,490,494.60/5,891.36
6. Step 6: Final answer
   x = 5,345.20