Finding the Fourth Proportional to 1,290.63, 1,779.39 and 936.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.63 : 1,779.39 = 936.27 : x
2. Step 2: Convert to fraction form
   1,290.63/1,779.39 = 936.27/x
3. Step 3: Cross multiply
   1,290.63x = 1,779.39 × 936.27
4. Step 4: Simplify right side
   1,290.63x = 1,665,989.48
5. Step 5: Solve for x
   x = 1,665,989.48/1,290.63
6. Step 6: Final answer
   x = 1,290.83