Finding the Fourth Proportional to 3,992.88, 5,990.38 and 3,557.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,992.88 : 5,990.38 = 3,557.12 : x
2. Step 2: Convert to fraction form
   3,992.88/5,990.38 = 3,557.12/x
3. Step 3: Cross multiply
   3,992.88x = 5,990.38 × 3,557.12
4. Step 4: Simplify right side
   3,992.88x = 21,308,500.51
5. Step 5: Solve for x
   x = 21,308,500.51/3,992.88
6. Step 6: Final answer
   x = 5,336.62