Finding the Fourth Proportional to 2,277.20, 3,142.72 and 1,393.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,277.20 : 3,142.72 = 1,393.12 : x
2. Step 2: Convert to fraction form
   2,277.20/3,142.72 = 1,393.12/x
3. Step 3: Cross multiply
   2,277.20x = 3,142.72 × 1,393.12
4. Step 4: Simplify right side
   2,277.20x = 4,378,186.09
5. Step 5: Solve for x
   x = 4,378,186.09/2,277.20
6. Step 6: Final answer
   x = 1,922.62