Finding the Fourth Proportional to 3,855.56, 5,320.14 and 2,261.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,855.56 : 5,320.14 = 2,261.72 : x
2. Step 2: Convert to fraction form
   3,855.56/5,320.14 = 2,261.72/x
3. Step 3: Cross multiply
   3,855.56x = 5,320.14 × 2,261.72
4. Step 4: Simplify right side
   3,855.56x = 12,032,667.04
5. Step 5: Solve for x
   x = 12,032,667.04/3,855.56
6. Step 6: Final answer
   x = 3,120.86