Finding the Fourth Proportional to 2,189.94, 3,285.54 and 1,266.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,189.94 : 3,285.54 = 1,266.16 : x
2. Step 2: Convert to fraction form
   2,189.94/3,285.54 = 1,266.16/x
3. Step 3: Cross multiply
   2,189.94x = 3,285.54 × 1,266.16
4. Step 4: Simplify right side
   2,189.94x = 4,160,019.33
5. Step 5: Solve for x
   x = 4,160,019.33/2,189.94
6. Step 6: Final answer
   x = 1,899.60