Finding the Fourth Proportional to 2,040.72, 3,061.20 and 886.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,040.72 : 3,061.20 = 886.56 : x
2. Step 2: Convert to fraction form
   2,040.72/3,061.20 = 886.56/x
3. Step 3: Cross multiply
   2,040.72x = 3,061.20 × 886.56
4. Step 4: Simplify right side
   2,040.72x = 2,713,937.47
5. Step 5: Solve for x
   x = 2,713,937.47/2,040.72
6. Step 6: Final answer
   x = 1,329.89