Finding the Fourth Proportional to 2,742.15, 3,782.79 and 2,111.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,742.15 : 3,782.79 = 2,111.43 : x
2. Step 2: Convert to fraction form
   2,742.15/3,782.79 = 2,111.43/x
3. Step 3: Cross multiply
   2,742.15x = 3,782.79 × 2,111.43
4. Step 4: Simplify right side
   2,742.15x = 7,987,096.29
5. Step 5: Solve for x
   x = 7,987,096.29/2,742.15
6. Step 6: Final answer
   x = 2,912.71