Finding the Fourth Proportional to 1,531.05, 2,112.72 and 867.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,531.05 : 2,112.72 = 867.96 : x
2. Step 2: Convert to fraction form
   1,531.05/2,112.72 = 867.96/x
3. Step 3: Cross multiply
   1,531.05x = 2,112.72 × 867.96
4. Step 4: Simplify right side
   1,531.05x = 1,833,763.90
5. Step 5: Solve for x
   x = 1,833,763.90/1,531.05
6. Step 6: Final answer
   x = 1,197.72