Finding the Fourth Proportional to 2,815.56, 4,220.30 and 1,171.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,815.56 : 4,220.30 = 1,171.06 : x
2. Step 2: Convert to fraction form
   2,815.56/4,220.30 = 1,171.06/x
3. Step 3: Cross multiply
   2,815.56x = 4,220.30 × 1,171.06
4. Step 4: Simplify right side
   2,815.56x = 4,942,216.89
5. Step 5: Solve for x
   x = 4,942,216.89/2,815.56
6. Step 6: Final answer
   x = 1,755.32