Finding the Fourth Proportional to 2,217.76, 3,059.52 and 1,285.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,217.76 : 3,059.52 = 1,285.72 : x
2. Step 2: Convert to fraction form
   2,217.76/3,059.52 = 1,285.72/x
3. Step 3: Cross multiply
   2,217.76x = 3,059.52 × 1,285.72
4. Step 4: Simplify right side
   2,217.76x = 3,933,686.05
5. Step 5: Solve for x
   x = 3,933,686.05/2,217.76
6. Step 6: Final answer
   x = 1,773.72