Finding the Fourth Proportional to 1,111.28, 1,532.91 and 718.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.28 : 1,532.91 = 718.54 : x
2. Step 2: Convert to fraction form
   1,111.28/1,532.91 = 718.54/x
3. Step 3: Cross multiply
   1,111.28x = 1,532.91 × 718.54
4. Step 4: Simplify right side
   1,111.28x = 1,101,453.32
5. Step 5: Solve for x
   x = 1,101,453.32/1,111.28
6. Step 6: Final answer
   x = 991.16