Finding the Fourth Proportional to 1,026.28, 1,536.31 and 661.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,026.28 : 1,536.31 = 661.33 : x
2. Step 2: Convert to fraction form
   1,026.28/1,536.31 = 661.33/x
3. Step 3: Cross multiply
   1,026.28x = 1,536.31 × 661.33
4. Step 4: Simplify right side
   1,026.28x = 1,015,998.56
5. Step 5: Solve for x
   x = 1,015,998.56/1,026.28
6. Step 6: Final answer
   x = 989.99