Finding the Fourth Proportional to 1,055.39, 1,456.34 and 613.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,055.39 : 1,456.34 = 613.28 : x
2. Step 2: Convert to fraction form
   1,055.39/1,456.34 = 613.28/x
3. Step 3: Cross multiply
   1,055.39x = 1,456.34 × 613.28
4. Step 4: Simplify right side
   1,055.39x = 893,144.20
5. Step 5: Solve for x
   x = 893,144.20/1,055.39
6. Step 6: Final answer
   x = 846.27