Finding the Fourth Proportional to 3,711.78, 5,117.85 and 2,385.54

Step by Step Solution

1. Step 1: Write the proportion equation
   3,711.78 : 5,117.85 = 2,385.54 : x
2. Step 2: Convert to fraction form
   3,711.78/5,117.85 = 2,385.54/x
3. Step 3: Cross multiply
   3,711.78x = 5,117.85 × 2,385.54
4. Step 4: Simplify right side
   3,711.78x = 12,208,835.89
5. Step 5: Solve for x
   x = 12,208,835.89/3,711.78
6. Step 6: Final answer
   x = 3,289.21