Finding the Fourth Proportional to 3,586.88, 5,380.43 and 989.82

Step by Step Solution

1. Step 1: Write the proportion equation
   3,586.88 : 5,380.43 = 989.82 : x
2. Step 2: Convert to fraction form
   3,586.88/5,380.43 = 989.82/x
3. Step 3: Cross multiply
   3,586.88x = 5,380.43 × 989.82
4. Step 4: Simplify right side
   3,586.88x = 5,325,652.27
5. Step 5: Solve for x
   x = 5,325,652.27/3,586.88
6. Step 6: Final answer
   x = 1,484.76