Finding the Fourth Proportional to 1,098.72, 1,517.15 and 1,019.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,098.72 : 1,517.15 = 1,019.58 : x
2. Step 2: Convert to fraction form
   1,098.72/1,517.15 = 1,019.58/x
3. Step 3: Cross multiply
   1,098.72x = 1,517.15 × 1,019.58
4. Step 4: Simplify right side
   1,098.72x = 1,546,855.80
5. Step 5: Solve for x
   x = 1,546,855.80/1,098.72
6. Step 6: Final answer
   x = 1,407.87