Finding the Fourth Proportional to 3,886.20, 5,814.54 and 2,156.04

Step by Step Solution

1. Step 1: Write the proportion equation
   3,886.20 : 5,814.54 = 2,156.04 : x
2. Step 2: Convert to fraction form
   3,886.20/5,814.54 = 2,156.04/x
3. Step 3: Cross multiply
   3,886.20x = 5,814.54 × 2,156.04
4. Step 4: Simplify right side
   3,886.20x = 12,536,380.82
5. Step 5: Solve for x
   x = 12,536,380.82/3,886.20
6. Step 6: Final answer
   x = 3,225.87