Finding the Fourth Proportional to 2,221.41, 3,326.18 and 1,439.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,221.41 : 3,326.18 = 1,439.15 : x
2. Step 2: Convert to fraction form
   2,221.41/3,326.18 = 1,439.15/x
3. Step 3: Cross multiply
   2,221.41x = 3,326.18 × 1,439.15
4. Step 4: Simplify right side
   2,221.41x = 4,786,848.12
5. Step 5: Solve for x
   x = 4,786,848.12/2,221.41
6. Step 6: Final answer
   x = 2,154.87