Finding the Fourth Proportional to 1,080.73, 1,485.90 and 961.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,080.73 : 1,485.90 = 961.55 : x
2. Step 2: Convert to fraction form
   1,080.73/1,485.90 = 961.55/x
3. Step 3: Cross multiply
   1,080.73x = 1,485.90 × 961.55
4. Step 4: Simplify right side
   1,080.73x = 1,428,762.34
5. Step 5: Solve for x
   x = 1,428,762.34/1,080.73
6. Step 6: Final answer
   x = 1,322.04