Finding the Fourth Proportional to 1,531.06, 2,112.88 and 867.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,531.06 : 2,112.88 = 867.89 : x
2. Step 2: Convert to fraction form
   1,531.06/2,112.88 = 867.89/x
3. Step 3: Cross multiply
   1,531.06x = 2,112.88 × 867.89
4. Step 4: Simplify right side
   1,531.06x = 1,833,755.35
5. Step 5: Solve for x
   x = 1,833,755.35/1,531.06
6. Step 6: Final answer
   x = 1,197.71