Finding the Fourth Proportional to 2,280.72, 3,421.28 and 981.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,280.72 : 3,421.28 = 981.88 : x
2. Step 2: Convert to fraction form
   2,280.72/3,421.28 = 981.88/x
3. Step 3: Cross multiply
   2,280.72x = 3,421.28 × 981.88
4. Step 4: Simplify right side
   2,280.72x = 3,359,286.41
5. Step 5: Solve for x
   x = 3,359,286.41/2,280.72
6. Step 6: Final answer
   x = 1,472.91