Finding the Fourth Proportional to 3,992.90, 5,509.97 and 2,200.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,992.90 : 5,509.97 = 2,200.31 : x
2. Step 2: Convert to fraction form
   3,992.90/5,509.97 = 2,200.31/x
3. Step 3: Cross multiply
   3,992.90x = 5,509.97 × 2,200.31
4. Step 4: Simplify right side
   3,992.90x = 12,123,675.82
5. Step 5: Solve for x
   x = 12,123,675.82/3,992.90
6. Step 6: Final answer
   x = 3,036.31