Finding the Fourth Proportional to 1,089.18, 1,631.31 and 894.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,089.18 : 1,631.31 = 894.78 : x
2. Step 2: Convert to fraction form
   1,089.18/1,631.31 = 894.78/x
3. Step 3: Cross multiply
   1,089.18x = 1,631.31 × 894.78
4. Step 4: Simplify right side
   1,089.18x = 1,459,663.56
5. Step 5: Solve for x
   x = 1,459,663.56/1,089.18
6. Step 6: Final answer
   x = 1,340.15