Finding the Fourth Proportional to 1,071.82, 1,479.01 and 678.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.82 : 1,479.01 = 678.83 : x
2. Step 2: Convert to fraction form
   1,071.82/1,479.01 = 678.83/x
3. Step 3: Cross multiply
   1,071.82x = 1,479.01 × 678.83
4. Step 4: Simplify right side
   1,071.82x = 1,003,992.96
5. Step 5: Solve for x
   x = 1,003,992.96/1,071.82
6. Step 6: Final answer
   x = 936.72