Finding the Fourth Proportional to 1,120.88, 1,546.56 and 678.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,120.88 : 1,546.56 = 678.69 : x
2. Step 2: Convert to fraction form
   1,120.88/1,546.56 = 678.69/x
3. Step 3: Cross multiply
   1,120.88x = 1,546.56 × 678.69
4. Step 4: Simplify right side
   1,120.88x = 1,049,624.53
5. Step 5: Solve for x
   x = 1,049,624.53/1,120.88
6. Step 6: Final answer
   x = 936.43