Finding the Fourth Proportional to 1,020.12, 1,528.72 and 990.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,020.12 : 1,528.72 = 990.52 : x
2. Step 2: Convert to fraction form
   1,020.12/1,528.72 = 990.52/x
3. Step 3: Cross multiply
   1,020.12x = 1,528.72 × 990.52
4. Step 4: Simplify right side
   1,020.12x = 1,514,227.73
5. Step 5: Solve for x
   x = 1,514,227.73/1,020.12
6. Step 6: Final answer
   x = 1,484.36