Finding the Fourth Proportional to 1,111.05, 1,533.21 and 613.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.05 : 1,533.21 = 613.71 : x
2. Step 2: Convert to fraction form
   1,111.05/1,533.21 = 613.71/x
3. Step 3: Cross multiply
   1,111.05x = 1,533.21 × 613.71
4. Step 4: Simplify right side
   1,111.05x = 940,946.31
5. Step 5: Solve for x
   x = 940,946.31/1,111.05
6. Step 6: Final answer
   x = 846.90