Finding the Fourth Proportional to 5,488.70, 8,231.40 and 3,915.59

Step by Step Solution

1. Step 1: Write the proportion equation
   5,488.70 : 8,231.40 = 3,915.59 : x
2. Step 2: Convert to fraction form
   5,488.70/8,231.40 = 3,915.59/x
3. Step 3: Cross multiply
   5,488.70x = 8,231.40 × 3,915.59
4. Step 4: Simplify right side
   5,488.70x = 32,230,746.37
5. Step 5: Solve for x
   x = 32,230,746.37/5,488.70
6. Step 6: Final answer
   x = 5,872.21