Finding the Fourth Proportional to 1,071.96, 1,479 and 678.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.96 : 1,479 = 678.72 : x
2. Step 2: Convert to fraction form
   1,071.96/1,479 = 678.72/x
3. Step 3: Cross multiply
   1,071.96x = 1,479 × 678.72
4. Step 4: Simplify right side
   1,071.96x = 1,003,826.88
5. Step 5: Solve for x
   x = 1,003,826.88/1,071.96
6. Step 6: Final answer
   x = 936.44