Finding the Fourth Proportional to 1,362.79, 1,879.45 and 890.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,362.79 : 1,879.45 = 890.50 : x
2. Step 2: Convert to fraction form
   1,362.79/1,879.45 = 890.50/x
3. Step 3: Cross multiply
   1,362.79x = 1,879.45 × 890.50
4. Step 4: Simplify right side
   1,362.79x = 1,673,650.23
5. Step 5: Solve for x
   x = 1,673,650.23/1,362.79
6. Step 6: Final answer
   x = 1,228.11