Finding the Fourth Proportional to 5,488.91, 7,574.63 and 3,131.09

Step by Step Solution

1. Step 1: Write the proportion equation
   5,488.91 : 7,574.63 = 3,131.09 : x
2. Step 2: Convert to fraction form
   5,488.91/7,574.63 = 3,131.09/x
3. Step 3: Cross multiply
   5,488.91x = 7,574.63 × 3,131.09
4. Step 4: Simplify right side
   5,488.91x = 23,716,832.59
5. Step 5: Solve for x
   x = 23,716,832.59/5,488.91
6. Step 6: Final answer
   x = 4,320.86