Finding the Fourth Proportional to 2,885.76, 3,978.18 and 2,221.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,885.76 : 3,978.18 = 2,221.56 : x
2. Step 2: Convert to fraction form
   2,885.76/3,978.18 = 2,221.56/x
3. Step 3: Cross multiply
   2,885.76x = 3,978.18 × 2,221.56
4. Step 4: Simplify right side
   2,885.76x = 8,837,765.56
5. Step 5: Solve for x
   x = 8,837,765.56/2,885.76
6. Step 6: Final answer
   x = 3,062.54