Finding the Fourth Proportional to 3,990.96, 5,989.80 and 3,529.89

Step by Step Solution

1. Step 1: Write the proportion equation
   3,990.96 : 5,989.80 = 3,529.89 : x
2. Step 2: Convert to fraction form
   3,990.96/5,989.80 = 3,529.89/x
3. Step 3: Cross multiply
   3,990.96x = 5,989.80 × 3,529.89
4. Step 4: Simplify right side
   3,990.96x = 21,143,335.12
5. Step 5: Solve for x
   x = 21,143,335.12/3,990.96
6. Step 6: Final answer
   x = 5,297.81