Finding the Fourth Proportional to 2,111.68, 2,914.92 and 1,890.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.68 : 2,914.92 = 1,890.22 : x
2. Step 2: Convert to fraction form
   2,111.68/2,914.92 = 1,890.22/x
3. Step 3: Cross multiply
   2,111.68x = 2,914.92 × 1,890.22
4. Step 4: Simplify right side
   2,111.68x = 5,509,840.08
5. Step 5: Solve for x
   x = 5,509,840.08/2,111.68
6. Step 6: Final answer
   x = 2,609.22