Finding the Fourth Proportional to 1,055.29, 1,456.44 and 613.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,055.29 : 1,456.44 = 613.21 : x
2. Step 2: Convert to fraction form
   1,055.29/1,456.44 = 613.21/x
3. Step 3: Cross multiply
   1,055.29x = 1,456.44 × 613.21
4. Step 4: Simplify right side
   1,055.29x = 893,103.57
5. Step 5: Solve for x
   x = 893,103.57/1,055.29
6. Step 6: Final answer
   x = 846.31