Finding the Fourth Proportional to 1,109.72, 1,531.12 and 716.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.72 : 1,531.12 = 716.24 : x
2. Step 2: Convert to fraction form
   1,109.72/1,531.12 = 716.24/x
3. Step 3: Cross multiply
   1,109.72x = 1,531.12 × 716.24
4. Step 4: Simplify right side
   1,109.72x = 1,096,649.39
5. Step 5: Solve for x
   x = 1,096,649.39/1,109.72
6. Step 6: Final answer
   x = 988.22