Finding the Fourth Proportional to 2,581.82, 3,872.88 and 1,021.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,581.82 : 3,872.88 = 1,021.70 : x
2. Step 2: Convert to fraction form
   2,581.82/3,872.88 = 1,021.70/x
3. Step 3: Cross multiply
   2,581.82x = 3,872.88 × 1,021.70
4. Step 4: Simplify right side
   2,581.82x = 3,956,921.50
5. Step 5: Solve for x
   x = 3,956,921.50/2,581.82
6. Step 6: Final answer
   x = 1,532.61