Finding the Fourth Proportional to 1,085.38, 1,498.22 and 1,003.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.38 : 1,498.22 = 1,003.57 : x
2. Step 2: Convert to fraction form
   1,085.38/1,498.22 = 1,003.57/x
3. Step 3: Cross multiply
   1,085.38x = 1,498.22 × 1,003.57
4. Step 4: Simplify right side
   1,085.38x = 1,503,568.65
5. Step 5: Solve for x
   x = 1,503,568.65/1,085.38
6. Step 6: Final answer
   x = 1,385.29