Finding the Fourth Proportional to 3,906.31, 5,393.22 and 3,485.94

Step by Step Solution

1. Step 1: Write the proportion equation
   3,906.31 : 5,393.22 = 3,485.94 : x
2. Step 2: Convert to fraction form
   3,906.31/5,393.22 = 3,485.94/x
3. Step 3: Cross multiply
   3,906.31x = 5,393.22 × 3,485.94
4. Step 4: Simplify right side
   3,906.31x = 18,800,421.10
5. Step 5: Solve for x
   x = 18,800,421.10/3,906.31
6. Step 6: Final answer
   x = 4,812.84