Finding the Fourth Proportional to 1,085.09, 1,498.32 and 687.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.09 : 1,498.32 = 687.45 : x
2. Step 2: Convert to fraction form
   1,085.09/1,498.32 = 687.45/x
3. Step 3: Cross multiply
   1,085.09x = 1,498.32 × 687.45
4. Step 4: Simplify right side
   1,085.09x = 1,030,020.08
5. Step 5: Solve for x
   x = 1,030,020.08/1,085.09
6. Step 6: Final answer
   x = 949.25