Finding the Fourth Proportional to 1,142.41, 1,713.61 and 276.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,142.41 : 1,713.61 = 276.72 : x
2. Step 2: Convert to fraction form
   1,142.41/1,713.61 = 276.72/x
3. Step 3: Cross multiply
   1,142.41x = 1,713.61 × 276.72
4. Step 4: Simplify right side
   1,142.41x = 474,190.16
5. Step 5: Solve for x
   x = 474,190.16/1,142.41
6. Step 6: Final answer
   x = 415.08