Finding the Fourth Proportional to 3,590.80, 5,385.72 and 993.92

Step by Step Solution

1. Step 1: Write the proportion equation
   3,590.80 : 5,385.72 = 993.92 : x
2. Step 2: Convert to fraction form
   3,590.80/5,385.72 = 993.92/x
3. Step 3: Cross multiply
   3,590.80x = 5,385.72 × 993.92
4. Step 4: Simplify right side
   3,590.80x = 5,352,974.82
5. Step 5: Solve for x
   x = 5,352,974.82/3,590.80
6. Step 6: Final answer
   x = 1,490.75