Finding the Fourth Proportional to 3,111.42, 4,668.93 and 2,870.85

Step by Step Solution

1. Step 1: Write the proportion equation
   3,111.42 : 4,668.93 = 2,870.85 : x
2. Step 2: Convert to fraction form
   3,111.42/4,668.93 = 2,870.85/x
3. Step 3: Cross multiply
   3,111.42x = 4,668.93 × 2,870.85
4. Step 4: Simplify right side
   3,111.42x = 13,403,797.69
5. Step 5: Solve for x
   x = 13,403,797.69/3,111.42
6. Step 6: Final answer
   x = 4,307.94