Finding the Fourth Proportional to 1,018.56, 1,403.04 and 821.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.56 : 1,403.04 = 821.52 : x
2. Step 2: Convert to fraction form
   1,018.56/1,403.04 = 821.52/x
3. Step 3: Cross multiply
   1,018.56x = 1,403.04 × 821.52
4. Step 4: Simplify right side
   1,018.56x = 1,152,625.42
5. Step 5: Solve for x
   x = 1,152,625.42/1,018.56
6. Step 6: Final answer
   x = 1,131.62