Finding the Fourth Proportional to 1,087.50, 1,629.91 and 867.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.50 : 1,629.91 = 867.22 : x
2. Step 2: Convert to fraction form
   1,087.50/1,629.91 = 867.22/x
3. Step 3: Cross multiply
   1,087.50x = 1,629.91 × 867.22
4. Step 4: Simplify right side
   1,087.50x = 1,413,487.56
5. Step 5: Solve for x
   x = 1,413,487.56/1,087.50
6. Step 6: Final answer
   x = 1,299.75