Finding the Fourth Proportional to 1,384.78, 1,911.77 and 960.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.78 : 1,911.77 = 960.02 : x
2. Step 2: Convert to fraction form
   1,384.78/1,911.77 = 960.02/x
3. Step 3: Cross multiply
   1,384.78x = 1,911.77 × 960.02
4. Step 4: Simplify right side
   1,384.78x = 1,835,337.44
5. Step 5: Solve for x
   x = 1,835,337.44/1,384.78
6. Step 6: Final answer
   x = 1,325.36