Finding the Fourth Proportional to 1,085.70, 1,498.47 and 613.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.70 : 1,498.47 = 613.59 : x
2. Step 2: Convert to fraction form
   1,085.70/1,498.47 = 613.59/x
3. Step 3: Cross multiply
   1,085.70x = 1,498.47 × 613.59
4. Step 4: Simplify right side
   1,085.70x = 919,446.21
5. Step 5: Solve for x
   x = 919,446.21/1,085.70
6. Step 6: Final answer
   x = 846.87