Finding the Fourth Proportional to 2,016, 3,024.72 and 990.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,016 : 3,024.72 = 990.72 : x
2. Step 2: Convert to fraction form
   2,016/3,024.72 = 990.72/x
3. Step 3: Cross multiply
   2,016x = 3,024.72 × 990.72
4. Step 4: Simplify right side
   2,016x = 2,996,650.60
5. Step 5: Solve for x
   x = 2,996,650.60/2,016
6. Step 6: Final answer
   x = 1,486.43