Finding the Fourth Proportional to 2,111.05, 2,913.23 and 1,166.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.05 : 2,913.23 = 1,166.90 : x
2. Step 2: Convert to fraction form
   2,111.05/2,913.23 = 1,166.90/x
3. Step 3: Cross multiply
   2,111.05x = 2,913.23 × 1,166.90
4. Step 4: Simplify right side
   2,111.05x = 3,399,448.09
5. Step 5: Solve for x
   x = 3,399,448.09/2,111.05
6. Step 6: Final answer
   x = 1,610.31