Finding the Fourth Proportional to 1,087.31, 1,631.49 and 676.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.31 : 1,631.49 = 676.34 : x
2. Step 2: Convert to fraction form
   1,087.31/1,631.49 = 676.34/x
3. Step 3: Cross multiply
   1,087.31x = 1,631.49 × 676.34
4. Step 4: Simplify right side
   1,087.31x = 1,103,441.95
5. Step 5: Solve for x
   x = 1,103,441.95/1,087.31
6. Step 6: Final answer
   x = 1,014.84