Finding the Fourth Proportional to 1,080.72, 1,617.73 and 873.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,080.72 : 1,617.73 = 873.56 : x
2. Step 2: Convert to fraction form
   1,080.72/1,617.73 = 873.56/x
3. Step 3: Cross multiply
   1,080.72x = 1,617.73 × 873.56
4. Step 4: Simplify right side
   1,080.72x = 1,413,184.22
5. Step 5: Solve for x
   x = 1,413,184.22/1,080.72
6. Step 6: Final answer
   x = 1,307.63