Finding the Fourth Proportional to 3,436.94, 5,155.20 and 2,120.94

Step by Step Solution

1. Step 1: Write the proportion equation
   3,436.94 : 5,155.20 = 2,120.94 : x
2. Step 2: Convert to fraction form
   3,436.94/5,155.20 = 2,120.94/x
3. Step 3: Cross multiply
   3,436.94x = 5,155.20 × 2,120.94
4. Step 4: Simplify right side
   3,436.94x = 10,933,869.89
5. Step 5: Solve for x
   x = 10,933,869.89/3,436.94
6. Step 6: Final answer
   x = 3,181.28