Finding the Fourth Proportional to 1,085.76, 1,498.28 and 613.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.76 : 1,498.28 = 613.71 : x
2. Step 2: Convert to fraction form
   1,085.76/1,498.28 = 613.71/x
3. Step 3: Cross multiply
   1,085.76x = 1,498.28 × 613.71
4. Step 4: Simplify right side
   1,085.76x = 919,503.46
5. Step 5: Solve for x
   x = 919,503.46/1,085.76
6. Step 6: Final answer
   x = 846.88