Finding the Fourth Proportional to 1,379.22, 1,900.38 and 936.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.22 : 1,900.38 = 936.36 : x
2. Step 2: Convert to fraction form
   1,379.22/1,900.38 = 936.36/x
3. Step 3: Cross multiply
   1,379.22x = 1,900.38 × 936.36
4. Step 4: Simplify right side
   1,379.22x = 1,779,439.82
5. Step 5: Solve for x
   x = 1,779,439.82/1,379.22
6. Step 6: Final answer
   x = 1,290.18