Finding the Fourth Proportional to 1,421.52, 1,960.56 and 979.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,421.52 : 1,960.56 = 979.32 : x
2. Step 2: Convert to fraction form
   1,421.52/1,960.56 = 979.32/x
3. Step 3: Cross multiply
   1,421.52x = 1,960.56 × 979.32
4. Step 4: Simplify right side
   1,421.52x = 1,920,015.62
5. Step 5: Solve for x
   x = 1,920,015.62/1,421.52
6. Step 6: Final answer
   x = 1,350.68