Finding the Fourth Proportional to 1,003.47, 1,382.31 and 872.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.47 : 1,382.31 = 872.25 : x
2. Step 2: Convert to fraction form
   1,003.47/1,382.31 = 872.25/x
3. Step 3: Cross multiply
   1,003.47x = 1,382.31 × 872.25
4. Step 4: Simplify right side
   1,003.47x = 1,205,719.90
5. Step 5: Solve for x
   x = 1,205,719.90/1,003.47
6. Step 6: Final answer
   x = 1,201.55