Finding the Fourth Proportional to 1,071.63, 1,479.01 and 678.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.63 : 1,479.01 = 678.69 : x
2. Step 2: Convert to fraction form
   1,071.63/1,479.01 = 678.69/x
3. Step 3: Cross multiply
   1,071.63x = 1,479.01 × 678.69
4. Step 4: Simplify right side
   1,071.63x = 1,003,794.69
5. Step 5: Solve for x
   x = 1,003,794.69/1,071.63
6. Step 6: Final answer
   x = 936.70