Finding the Fourth Proportional to 2,815.85, 4,222.50 and 1,171.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,815.85 : 4,222.50 = 1,171.42 : x
2. Step 2: Convert to fraction form
   2,815.85/4,222.50 = 1,171.42/x
3. Step 3: Cross multiply
   2,815.85x = 4,222.50 × 1,171.42
4. Step 4: Simplify right side
   2,815.85x = 4,946,306.00
5. Step 5: Solve for x
   x = 4,946,306.00/2,815.85
6. Step 6: Final answer
   x = 1,756.59