Finding the Fourth Proportional to 2,169.89, 3,254.79 and 1,390.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,169.89 : 3,254.79 = 1,390.27 : x
2. Step 2: Convert to fraction form
   2,169.89/3,254.79 = 1,390.27/x
3. Step 3: Cross multiply
   2,169.89x = 3,254.79 × 1,390.27
4. Step 4: Simplify right side
   2,169.89x = 4,525,036.89
5. Step 5: Solve for x
   x = 4,525,036.89/2,169.89
6. Step 6: Final answer
   x = 2,085.38