Finding the Fourth Proportional to 3,910.15, 5,406.42 and 3,418.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,910.15 : 5,406.42 = 3,418.12 : x
2. Step 2: Convert to fraction form
   3,910.15/5,406.42 = 3,418.12/x
3. Step 3: Cross multiply
   3,910.15x = 5,406.42 × 3,418.12
4. Step 4: Simplify right side
   3,910.15x = 18,479,792.33
5. Step 5: Solve for x
   x = 18,479,792.33/3,910.15
6. Step 6: Final answer
   x = 4,726.11