Finding the Fourth Proportional to 3,991.88, 5,988.88 and 3,556.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,991.88 : 5,988.88 = 3,556.12 : x
2. Step 2: Convert to fraction form
   3,991.88/5,988.88 = 3,556.12/x
3. Step 3: Cross multiply
   3,991.88x = 5,988.88 × 3,556.12
4. Step 4: Simplify right side
   3,991.88x = 21,297,175.95
5. Step 5: Solve for x
   x = 21,297,175.95/3,991.88
6. Step 6: Final answer
   x = 5,335.12