Finding the Fourth Proportional to 3,904.86, 5,388.54 and 2,391.96

Step by Step Solution

1. Step 1: Write the proportion equation
   3,904.86 : 5,388.54 = 2,391.96 : x
2. Step 2: Convert to fraction form
   3,904.86/5,388.54 = 2,391.96/x
3. Step 3: Cross multiply
   3,904.86x = 5,388.54 × 2,391.96
4. Step 4: Simplify right side
   3,904.86x = 12,889,172.14
5. Step 5: Solve for x
   x = 12,889,172.14/3,904.86
6. Step 6: Final answer
   x = 3,300.80