Finding the Fourth Proportional to 1,111.05, 1,533.20 and 712.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.05 : 1,533.20 = 712.16 : x
2. Step 2: Convert to fraction form
   1,111.05/1,533.20 = 712.16/x
3. Step 3: Cross multiply
   1,111.05x = 1,533.20 × 712.16
4. Step 4: Simplify right side
   1,111.05x = 1,091,878.23
5. Step 5: Solve for x
   x = 1,091,878.23/1,111.05
6. Step 6: Final answer
   x = 982.74