Finding the Fourth Proportional to 1,112.94, 1,669.31 and 872.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.94 : 1,669.31 = 872.37 : x
2. Step 2: Convert to fraction form
   1,112.94/1,669.31 = 872.37/x
3. Step 3: Cross multiply
   1,112.94x = 1,669.31 × 872.37
4. Step 4: Simplify right side
   1,112.94x = 1,456,254.87
5. Step 5: Solve for x
   x = 1,456,254.87/1,112.94
6. Step 6: Final answer
   x = 1,308.48