Finding the Fourth Proportional to 1,375.92, 1,898.22 and 878.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.92 : 1,898.22 = 878.43 : x
2. Step 2: Convert to fraction form
   1,375.92/1,898.22 = 878.43/x
3. Step 3: Cross multiply
   1,375.92x = 1,898.22 × 878.43
4. Step 4: Simplify right side
   1,375.92x = 1,667,453.39
5. Step 5: Solve for x
   x = 1,667,453.39/1,375.92
6. Step 6: Final answer
   x = 1,211.88