Finding the Fourth Proportional to 2,111.15, 2,912.01 and 1,271.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.15 : 2,912.01 = 1,271.28 : x
2. Step 2: Convert to fraction form
   2,111.15/2,912.01 = 1,271.28/x
3. Step 3: Cross multiply
   2,111.15x = 2,912.01 × 1,271.28
4. Step 4: Simplify right side
   2,111.15x = 3,701,980.07
5. Step 5: Solve for x
   x = 3,701,980.07/2,111.15
6. Step 6: Final answer
   x = 1,753.54