Finding the Fourth Proportional to 1,085.80, 1,498.29 and 613.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.80 : 1,498.29 = 613.72 : x
2. Step 2: Convert to fraction form
   1,085.80/1,498.29 = 613.72/x
3. Step 3: Cross multiply
   1,085.80x = 1,498.29 × 613.72
4. Step 4: Simplify right side
   1,085.80x = 919,530.54
5. Step 5: Solve for x
   x = 919,530.54/1,085.80
6. Step 6: Final answer
   x = 846.87