Finding the Fourth Proportional to 1,018.22, 1,524.69 and 872.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.22 : 1,524.69 = 872.91 : x
2. Step 2: Convert to fraction form
   1,018.22/1,524.69 = 872.91/x
3. Step 3: Cross multiply
   1,018.22x = 1,524.69 × 872.91
4. Step 4: Simplify right side
   1,018.22x = 1,330,917.15
5. Step 5: Solve for x
   x = 1,330,917.15/1,018.22
6. Step 6: Final answer
   x = 1,307.11