Finding the Fourth Proportional to 1,100.31, 1,641.18 and 936.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.31 : 1,641.18 = 936.15 : x
2. Step 2: Convert to fraction form
   1,100.31/1,641.18 = 936.15/x
3. Step 3: Cross multiply
   1,100.31x = 1,641.18 × 936.15
4. Step 4: Simplify right side
   1,100.31x = 1,536,390.66
5. Step 5: Solve for x
   x = 1,536,390.66/1,100.31
6. Step 6: Final answer
   x = 1,396.33