Finding the Fourth Proportional to 1,378.49, 1,902.62 and 936.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,378.49 : 1,902.62 = 936.56 : x
2. Step 2: Convert to fraction form
   1,378.49/1,902.62 = 936.56/x
3. Step 3: Cross multiply
   1,378.49x = 1,902.62 × 936.56
4. Step 4: Simplify right side
   1,378.49x = 1,781,924.89
5. Step 5: Solve for x
   x = 1,781,924.89/1,378.49
6. Step 6: Final answer
   x = 1,292.67