Finding the Fourth Proportional to 1,067.50, 1,471.81 and 890.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,067.50 : 1,471.81 = 890.71 : x
2. Step 2: Convert to fraction form
   1,067.50/1,471.81 = 890.71/x
3. Step 3: Cross multiply
   1,067.50x = 1,471.81 × 890.71
4. Step 4: Simplify right side
   1,067.50x = 1,310,955.89
5. Step 5: Solve for x
   x = 1,310,955.89/1,067.50
6. Step 6: Final answer
   x = 1,228.06