Finding the Fourth Proportional to 3,410.16, 5,115.57 and 911.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,410.16 : 5,115.57 = 911.31 : x
2. Step 2: Convert to fraction form
   3,410.16/5,115.57 = 911.31/x
3. Step 3: Cross multiply
   3,410.16x = 5,115.57 × 911.31
4. Step 4: Simplify right side
   3,410.16x = 4,661,870.10
5. Step 5: Solve for x
   x = 4,661,870.10/3,410.16
6. Step 6: Final answer
   x = 1,367.05