Finding the Fourth Proportional to 2,668.55, 3,684.42 and 2,111.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,668.55 : 3,684.42 = 2,111.74 : x
2. Step 2: Convert to fraction form
   2,668.55/3,684.42 = 2,111.74/x
3. Step 3: Cross multiply
   2,668.55x = 3,684.42 × 2,111.74
4. Step 4: Simplify right side
   2,668.55x = 7,780,527.88
5. Step 5: Solve for x
   x = 7,780,527.88/2,668.55
6. Step 6: Final answer
   x = 2,915.64