Finding the Fourth Proportional to 3,406.02, 5,115.51 and 2,116.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,406.02 : 5,115.51 = 2,116.50 : x
2. Step 2: Convert to fraction form
   3,406.02/5,115.51 = 2,116.50/x
3. Step 3: Cross multiply
   3,406.02x = 5,115.51 × 2,116.50
4. Step 4: Simplify right side
   3,406.02x = 10,826,976.92
5. Step 5: Solve for x
   x = 10,826,976.92/3,406.02
6. Step 6: Final answer
   x = 3,178.78