Finding the Fourth Proportional to 1,085.63, 1,498.11 and 613.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.63 : 1,498.11 = 613.58 : x
2. Step 2: Convert to fraction form
   1,085.63/1,498.11 = 613.58/x
3. Step 3: Cross multiply
   1,085.63x = 1,498.11 × 613.58
4. Step 4: Simplify right side
   1,085.63x = 919,210.33
5. Step 5: Solve for x
   x = 919,210.33/1,085.63
6. Step 6: Final answer
   x = 846.71