Finding the Fourth Proportional to 1,111.05, 1,533.23 and 613.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.05 : 1,533.23 = 613.69 : x
2. Step 2: Convert to fraction form
   1,111.05/1,533.23 = 613.69/x
3. Step 3: Cross multiply
   1,111.05x = 1,533.23 × 613.69
4. Step 4: Simplify right side
   1,111.05x = 940,931.94
5. Step 5: Solve for x
   x = 940,931.94/1,111.05
6. Step 6: Final answer
   x = 846.89