Finding the Fourth Proportional to 2,111.11, 2,913.74 and 1,392.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.11 : 2,913.74 = 1,392.03 : x
2. Step 2: Convert to fraction form
   2,111.11/2,913.74 = 1,392.03/x
3. Step 3: Cross multiply
   2,111.11x = 2,913.74 × 1,392.03
4. Step 4: Simplify right side
   2,111.11x = 4,056,006.53
5. Step 5: Solve for x
   x = 4,056,006.53/2,111.11
6. Step 6: Final answer
   x = 1,921.27