Finding the Fourth Proportional to 1,080.47, 1,491.30 and 872.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,080.47 : 1,491.30 = 872.03 : x
2. Step 2: Convert to fraction form
   1,080.47/1,491.30 = 872.03/x
3. Step 3: Cross multiply
   1,080.47x = 1,491.30 × 872.03
4. Step 4: Simplify right side
   1,080.47x = 1,300,453.98
5. Step 5: Solve for x
   x = 1,300,453.98/1,080.47
6. Step 6: Final answer
   x = 1,203.60