Finding the Fourth Proportional to 5,557.32, 7,662.78 and 5,218.38

Step by Step Solution

1. Step 1: Write the proportion equation
   5,557.32 : 7,662.78 = 5,218.38 : x
2. Step 2: Convert to fraction form
   5,557.32/7,662.78 = 5,218.38/x
3. Step 3: Cross multiply
   5,557.32x = 7,662.78 × 5,218.38
4. Step 4: Simplify right side
   5,557.32x = 39,987,297.90
5. Step 5: Solve for x
   x = 39,987,297.90/5,557.32
6. Step 6: Final answer
   x = 7,195.43