Finding the Fourth Proportional to 1,085.06, 1,498.34 and 687.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.06 : 1,498.34 = 687.42 : x
2. Step 2: Convert to fraction form
   1,085.06/1,498.34 = 687.42/x
3. Step 3: Cross multiply
   1,085.06x = 1,498.34 × 687.42
4. Step 4: Simplify right side
   1,085.06x = 1,029,990.60
5. Step 5: Solve for x
   x = 1,029,990.60/1,085.06
6. Step 6: Final answer
   x = 949.25