Finding the Fourth Proportional to 2,111.45, 2,913.55 and 1,167.11

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.45 : 2,913.55 = 1,167.11 : x
2. Step 2: Convert to fraction form
   2,111.45/2,913.55 = 1,167.11/x
3. Step 3: Cross multiply
   2,111.45x = 2,913.55 × 1,167.11
4. Step 4: Simplify right side
   2,111.45x = 3,400,439.07
5. Step 5: Solve for x
   x = 3,400,439.07/2,111.45
6. Step 6: Final answer
   x = 1,610.48