Finding the Fourth Proportional to 2,100.38, 3,151.17 and 867.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.38 : 3,151.17 = 867.15 : x
2. Step 2: Convert to fraction form
   2,100.38/3,151.17 = 867.15/x
3. Step 3: Cross multiply
   2,100.38x = 3,151.17 × 867.15
4. Step 4: Simplify right side
   2,100.38x = 2,732,537.07
5. Step 5: Solve for x
   x = 2,732,537.07/2,100.38
6. Step 6: Final answer
   x = 1,300.98