Finding the Fourth Proportional to 1,352.38, 1,865.02 and 879.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,352.38 : 1,865.02 = 879.78 : x
2. Step 2: Convert to fraction form
   1,352.38/1,865.02 = 879.78/x
3. Step 3: Cross multiply
   1,352.38x = 1,865.02 × 879.78
4. Step 4: Simplify right side
   1,352.38x = 1,640,807.30
5. Step 5: Solve for x
   x = 1,640,807.30/1,352.38
6. Step 6: Final answer
   x = 1,213.27