Finding the Fourth Proportional to 1,362.29, 1,878.77 and 890

Step by Step Solution

1. Step 1: Write the proportion equation
   1,362.29 : 1,878.77 = 890 : x
2. Step 2: Convert to fraction form
   1,362.29/1,878.77 = 890/x
3. Step 3: Cross multiply
   1,362.29x = 1,878.77 × 890
4. Step 4: Simplify right side
   1,362.29x = 1,672,100.85
5. Step 5: Solve for x
   x = 1,672,100.85/1,362.29
6. Step 6: Final answer
   x = 1,227.42