Finding the Fourth Proportional to 1,111.10, 1,533.33 and 718.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.10 : 1,533.33 = 718.81 : x
2. Step 2: Convert to fraction form
   1,111.10/1,533.33 = 718.81/x
3. Step 3: Cross multiply
   1,111.10x = 1,533.33 × 718.81
4. Step 4: Simplify right side
   1,111.10x = 1,102,169.10
5. Step 5: Solve for x
   x = 1,102,169.10/1,111.10
6. Step 6: Final answer
   x = 991.97