Finding the Fourth Proportional to 2,838.18, 3,918.69 and 2,131.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,838.18 : 3,918.69 = 2,131.59 : x
2. Step 2: Convert to fraction form
   2,838.18/3,918.69 = 2,131.59/x
3. Step 3: Cross multiply
   2,838.18x = 3,918.69 × 2,131.59
4. Step 4: Simplify right side
   2,838.18x = 8,353,040.42
5. Step 5: Solve for x
   x = 8,353,040.42/2,838.18
6. Step 6: Final answer
   x = 2,943.10