Finding the Fourth Proportional to 1,443.40, 2,164.55 and 1,138.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.40 : 2,164.55 = 1,138.84 : x
2. Step 2: Convert to fraction form
   1,443.40/2,164.55 = 1,138.84/x
3. Step 3: Cross multiply
   1,443.40x = 2,164.55 × 1,138.84
4. Step 4: Simplify right side
   1,443.40x = 2,465,065.30
5. Step 5: Solve for x
   x = 2,465,065.30/1,443.40
6. Step 6: Final answer
   x = 1,707.82