Finding the Fourth Proportional to 1,055.30, 1,456.31 and 613.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,055.30 : 1,456.31 = 613.31 : x
2. Step 2: Convert to fraction form
   1,055.30/1,456.31 = 613.31/x
3. Step 3: Cross multiply
   1,055.30x = 1,456.31 × 613.31
4. Step 4: Simplify right side
   1,055.30x = 893,163.74
5. Step 5: Solve for x
   x = 893,163.74/1,055.30
6. Step 6: Final answer
   x = 846.36