Finding the Fourth Proportional to 1,019.78, 1,406.67 and 889.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.78 : 1,406.67 = 889.10 : x
2. Step 2: Convert to fraction form
   1,019.78/1,406.67 = 889.10/x
3. Step 3: Cross multiply
   1,019.78x = 1,406.67 × 889.10
4. Step 4: Simplify right side
   1,019.78x = 1,250,670.30
5. Step 5: Solve for x
   x = 1,250,670.30/1,019.78
6. Step 6: Final answer
   x = 1,226.41