Finding the Fourth Proportional to 2,211.60, 3,315.24 and 1,056.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,211.60 : 3,315.24 = 1,056.72 : x
2. Step 2: Convert to fraction form
   2,211.60/3,315.24 = 1,056.72/x
3. Step 3: Cross multiply
   2,211.60x = 3,315.24 × 1,056.72
4. Step 4: Simplify right side
   2,211.60x = 3,503,280.41
5. Step 5: Solve for x
   x = 3,503,280.41/2,211.60
6. Step 6: Final answer
   x = 1,584.05