Finding the Fourth Proportional to 2,216.40, 3,316.42 and 1,339.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.40 : 3,316.42 = 1,339.30 : x
2. Step 2: Convert to fraction form
   2,216.40/3,316.42 = 1,339.30/x
3. Step 3: Cross multiply
   2,216.40x = 3,316.42 × 1,339.30
4. Step 4: Simplify right side
   2,216.40x = 4,441,681.31
5. Step 5: Solve for x
   x = 4,441,681.31/2,216.40
6. Step 6: Final answer
   x = 2,004.01