Finding the Fourth Proportional to 7,238.70, 9,990.95 and 5,541.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,238.70 : 9,990.95 = 5,541.72 : x
2. Step 2: Convert to fraction form
   7,238.70/9,990.95 = 5,541.72/x
3. Step 3: Cross multiply
   7,238.70x = 9,990.95 × 5,541.72
4. Step 4: Simplify right side
   7,238.70x = 55,367,019.73
5. Step 5: Solve for x
   x = 55,367,019.73/7,238.70
6. Step 6: Final answer
   x = 7,648.75