Finding the Fourth Proportional to 2,111.38, 2,913.21 and 1,271.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.38 : 2,913.21 = 1,271.86 : x
2. Step 2: Convert to fraction form
   2,111.38/2,913.21 = 1,271.86/x
3. Step 3: Cross multiply
   2,111.38x = 2,913.21 × 1,271.86
4. Step 4: Simplify right side
   2,111.38x = 3,705,195.27
5. Step 5: Solve for x
   x = 3,705,195.27/2,111.38
6. Step 6: Final answer
   x = 1,754.87