Finding the Fourth Proportional to 2,216.48, 3,058.78 and 1,431.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.48 : 3,058.78 = 1,431.89 : x
2. Step 2: Convert to fraction form
   2,216.48/3,058.78 = 1,431.89/x
3. Step 3: Cross multiply
   2,216.48x = 3,058.78 × 1,431.89
4. Step 4: Simplify right side
   2,216.48x = 4,379,836.49
5. Step 5: Solve for x
   x = 4,379,836.49/2,216.48
6. Step 6: Final answer
   x = 1,976.03