Finding the Fourth Proportional to 1,380.67, 1,904.94 and 960.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.67 : 1,904.94 = 960.55 : x
2. Step 2: Convert to fraction form
   1,380.67/1,904.94 = 960.55/x
3. Step 3: Cross multiply
   1,380.67x = 1,904.94 × 960.55
4. Step 4: Simplify right side
   1,380.67x = 1,829,785.35
5. Step 5: Solve for x
   x = 1,829,785.35/1,380.67
6. Step 6: Final answer
   x = 1,325.29