Finding the Fourth Proportional to 2,275.20, 3,138.72 and 1,436.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,275.20 : 3,138.72 = 1,436.96 : x
2. Step 2: Convert to fraction form
   2,275.20/3,138.72 = 1,436.96/x
3. Step 3: Cross multiply
   2,275.20x = 3,138.72 × 1,436.96
4. Step 4: Simplify right side
   2,275.20x = 4,510,215.09
5. Step 5: Solve for x
   x = 4,510,215.09/2,275.20
6. Step 6: Final answer
   x = 1,982.34