Finding the Fourth Proportional to 3,885.94, 5,362.61 and 2,117.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,885.94 : 5,362.61 = 2,117.55 : x
2. Step 2: Convert to fraction form
   3,885.94/5,362.61 = 2,117.55/x
3. Step 3: Cross multiply
   3,885.94x = 5,362.61 × 2,117.55
4. Step 4: Simplify right side
   3,885.94x = 11,355,594.81
5. Step 5: Solve for x
   x = 11,355,594.81/3,885.94
6. Step 6: Final answer
   x = 2,922.23