Finding the Fourth Proportional to 1,120.83, 1,546.88 and 678.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,120.83 : 1,546.88 = 678.72 : x
2. Step 2: Convert to fraction form
   1,120.83/1,546.88 = 678.72/x
3. Step 3: Cross multiply
   1,120.83x = 1,546.88 × 678.72
4. Step 4: Simplify right side
   1,120.83x = 1,049,887.27
5. Step 5: Solve for x
   x = 1,049,887.27/1,120.83
6. Step 6: Final answer
   x = 936.71