Finding the Fourth Proportional to 1,098.82, 1,515.81 and 836.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,098.82 : 1,515.81 = 836.38 : x
2. Step 2: Convert to fraction form
   1,098.82/1,515.81 = 836.38/x
3. Step 3: Cross multiply
   1,098.82x = 1,515.81 × 836.38
4. Step 4: Simplify right side
   1,098.82x = 1,267,793.17
5. Step 5: Solve for x
   x = 1,267,793.17/1,098.82
6. Step 6: Final answer
   x = 1,153.78