Finding the Fourth Proportional to 1,402.87, 1,932.90 and 936.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,402.87 : 1,932.90 = 936.31 : x
2. Step 2: Convert to fraction form
   1,402.87/1,932.90 = 936.31/x
3. Step 3: Cross multiply
   1,402.87x = 1,932.90 × 936.31
4. Step 4: Simplify right side
   1,402.87x = 1,809,793.60
5. Step 5: Solve for x
   x = 1,809,793.60/1,402.87
6. Step 6: Final answer
   x = 1,290.07