Finding the Fourth Proportional to 2,538.68, 3,805.42 and 1,440.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,538.68 : 3,805.42 = 1,440.72 : x
2. Step 2: Convert to fraction form
   2,538.68/3,805.42 = 1,440.72/x
3. Step 3: Cross multiply
   2,538.68x = 3,805.42 × 1,440.72
4. Step 4: Simplify right side
   2,538.68x = 5,482,544.70
5. Step 5: Solve for x
   x = 5,482,544.70/2,538.68
6. Step 6: Final answer
   x = 2,159.60