Finding the Fourth Proportional to 2,111.88, 2,913.90 and 1,272.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.88 : 2,913.90 = 1,272.36 : x
2. Step 2: Convert to fraction form
   2,111.88/2,913.90 = 1,272.36/x
3. Step 3: Cross multiply
   2,111.88x = 2,913.90 × 1,272.36
4. Step 4: Simplify right side
   2,111.88x = 3,707,529.80
5. Step 5: Solve for x
   x = 3,707,529.80/2,111.88
6. Step 6: Final answer
   x = 1,755.56