Finding the Fourth Proportional to 1,322.16, 1,983.72 and 1,080.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,322.16 : 1,983.72 = 1,080.24 : x
2. Step 2: Convert to fraction form
   1,322.16/1,983.72 = 1,080.24/x
3. Step 3: Cross multiply
   1,322.16x = 1,983.72 × 1,080.24
4. Step 4: Simplify right side
   1,322.16x = 2,142,893.69
5. Step 5: Solve for x
   x = 2,142,893.69/1,322.16
6. Step 6: Final answer
   x = 1,620.75