Finding the Fourth Proportional to 1,356.03, 1,871.30 and 890.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,356.03 : 1,871.30 = 890.25 : x
2. Step 2: Convert to fraction form
   1,356.03/1,871.30 = 890.25/x
3. Step 3: Cross multiply
   1,356.03x = 1,871.30 × 890.25
4. Step 4: Simplify right side
   1,356.03x = 1,665,920.37
5. Step 5: Solve for x
   x = 1,665,920.37/1,356.03
6. Step 6: Final answer
   x = 1,228.53