Finding the Fourth Proportional to 3,977.86, 5,940.78 and 3,386.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,977.86 : 5,940.78 = 3,386.56 : x
2. Step 2: Convert to fraction form
   3,977.86/5,940.78 = 3,386.56/x
3. Step 3: Cross multiply
   3,977.86x = 5,940.78 × 3,386.56
4. Step 4: Simplify right side
   3,977.86x = 20,118,807.92
5. Step 5: Solve for x
   x = 20,118,807.92/3,977.86
6. Step 6: Final answer
   x = 5,057.70