Finding the Fourth Proportional to 7,238.58, 9,991.22 and 4,255.39

Step by Step Solution

1. Step 1: Write the proportion equation
   7,238.58 : 9,991.22 = 4,255.39 : x
2. Step 2: Convert to fraction form
   7,238.58/9,991.22 = 4,255.39/x
3. Step 3: Cross multiply
   7,238.58x = 9,991.22 × 4,255.39
4. Step 4: Simplify right side
   7,238.58x = 42,516,472.69
5. Step 5: Solve for x
   x = 42,516,472.69/7,238.58
6. Step 6: Final answer
   x = 5,873.59