Finding the Fourth Proportional to 3,456.30, 5,180.35 and 1,992.43

Step by Step Solution

1. Step 1: Write the proportion equation
   3,456.30 : 5,180.35 = 1,992.43 : x
2. Step 2: Convert to fraction form
   3,456.30/5,180.35 = 1,992.43/x
3. Step 3: Cross multiply
   3,456.30x = 5,180.35 × 1,992.43
4. Step 4: Simplify right side
   3,456.30x = 10,321,466.82
5. Step 5: Solve for x
   x = 10,321,466.82/3,456.30
6. Step 6: Final answer
   x = 2,986.28