Finding the Fourth Proportional to 5,405.00, 8,108.71 and 3,911.15

Step by Step Solution

1. Step 1: Write the proportion equation
   5,405.00 : 8,108.71 = 3,911.15 : x
2. Step 2: Convert to fraction form
   5,405.00/8,108.71 = 3,911.15/x
3. Step 3: Cross multiply
   5,405.00x = 8,108.71 × 3,911.15
4. Step 4: Simplify right side
   5,405.00x = 31,714,391.61
5. Step 5: Solve for x
   x = 31,714,391.61/5,405.00
6. Step 6: Final answer
   x = 5,867.61