Finding the Fourth Proportional to 1,111.17, 1,533.39 and 613.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.17 : 1,533.39 = 613.79 : x
2. Step 2: Convert to fraction form
   1,111.17/1,533.39 = 613.79/x
3. Step 3: Cross multiply
   1,111.17x = 1,533.39 × 613.79
4. Step 4: Simplify right side
   1,111.17x = 941,183.28
5. Step 5: Solve for x
   x = 941,183.28/1,111.17
6. Step 6: Final answer
   x = 847.02