Finding the Fourth Proportional to 9,922.18, 13,690.47 and 5,728

Step by Step Solution

1. Step 1: Write the proportion equation
   9,922.18 : 13,690.47 = 5,728 : x
2. Step 2: Convert to fraction form
   9,922.18/13,690.47 = 5,728/x
3. Step 3: Cross multiply
   9,922.18x = 13,690.47 × 5,728
4. Step 4: Simplify right side
   9,922.18x = 78,419,012.16
5. Step 5: Solve for x
   x = 78,419,012.16/9,922.18
6. Step 6: Final answer
   x = 7,903.41