Finding the Fourth Proportional to 1,111.13, 1,533.38 and 613.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.13 : 1,533.38 = 613.79 : x
2. Step 2: Convert to fraction form
   1,111.13/1,533.38 = 613.79/x
3. Step 3: Cross multiply
   1,111.13x = 1,533.38 × 613.79
4. Step 4: Simplify right side
   1,111.13x = 941,173.31
5. Step 5: Solve for x
   x = 941,173.31/1,111.13
6. Step 6: Final answer
   x = 847.04