Finding the Fourth Proportional to 1,111.18, 1,533.40 and 613.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.18 : 1,533.40 = 613.81 : x
2. Step 2: Convert to fraction form
   1,111.18/1,533.40 = 613.81/x
3. Step 3: Cross multiply
   1,111.18x = 1,533.40 × 613.81
4. Step 4: Simplify right side
   1,111.18x = 941,218.55
5. Step 5: Solve for x
   x = 941,218.55/1,111.18
6. Step 6: Final answer
   x = 847.05