Finding the Fourth Proportional to 3,998.16, 5,505.93 and 3,986.01

Step by Step Solution

1. Step 1: Write the proportion equation
   3,998.16 : 5,505.93 = 3,986.01 : x
2. Step 2: Convert to fraction form
   3,998.16/5,505.93 = 3,986.01/x
3. Step 3: Cross multiply
   3,998.16x = 5,505.93 × 3,986.01
4. Step 4: Simplify right side
   3,998.16x = 21,946,692.04
5. Step 5: Solve for x
   x = 21,946,692.04/3,998.16
6. Step 6: Final answer
   x = 5,489.20