Finding the Fourth Proportional to 1,380.47, 1,905.41 and 960.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.47 : 1,905.41 = 960.89 : x
2. Step 2: Convert to fraction form
   1,380.47/1,905.41 = 960.89/x
3. Step 3: Cross multiply
   1,380.47x = 1,905.41 × 960.89
4. Step 4: Simplify right side
   1,380.47x = 1,830,884.61
5. Step 5: Solve for x
   x = 1,830,884.61/1,380.47
6. Step 6: Final answer
   x = 1,326.28