Finding the Fourth Proportional to 2,111.39, 3,167.09 and 1,288.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.39 : 3,167.09 = 1,288.02 : x
2. Step 2: Convert to fraction form
   2,111.39/3,167.09 = 1,288.02/x
3. Step 3: Cross multiply
   2,111.39x = 3,167.09 × 1,288.02
4. Step 4: Simplify right side
   2,111.39x = 4,079,268.82
5. Step 5: Solve for x
   x = 4,079,268.82/2,111.39
6. Step 6: Final answer
   x = 1,932.03