Finding the Fourth Proportional to 1,485.78, 2,227.14 and 867.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,485.78 : 2,227.14 = 867.61 : x
2. Step 2: Convert to fraction form
   1,485.78/2,227.14 = 867.61/x
3. Step 3: Cross multiply
   1,485.78x = 2,227.14 × 867.61
4. Step 4: Simplify right side
   1,485.78x = 1,932,289.28
5. Step 5: Solve for x
   x = 1,932,289.28/1,485.78
6. Step 6: Final answer
   x = 1,300.52