Finding the Fourth Proportional to 1,111.38, 1,533.57 and 613.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.38 : 1,533.57 = 613.98 : x
2. Step 2: Convert to fraction form
   1,111.38/1,533.57 = 613.98/x
3. Step 3: Cross multiply
   1,111.38x = 1,533.57 × 613.98
4. Step 4: Simplify right side
   1,111.38x = 941,581.31
5. Step 5: Solve for x
   x = 941,581.31/1,111.38
6. Step 6: Final answer
   x = 847.22