Finding the Fourth Proportional to 5,590.38, 7,711.98 and 3,911.16

Step by Step Solution

1. Step 1: Write the proportion equation
   5,590.38 : 7,711.98 = 3,911.16 : x
2. Step 2: Convert to fraction form
   5,590.38/7,711.98 = 3,911.16/x
3. Step 3: Cross multiply
   5,590.38x = 7,711.98 × 3,911.16
4. Step 4: Simplify right side
   5,590.38x = 30,162,787.70
5. Step 5: Solve for x
   x = 30,162,787.70/5,590.38
6. Step 6: Final answer
   x = 5,395.48