Finding the Fourth Proportional to 784.31, 1,081.59 and 679.34

Step by Step Solution

1. Step 1: Write the proportion equation
   784.31 : 1,081.59 = 679.34 : x
2. Step 2: Convert to fraction form
   784.31/1,081.59 = 679.34/x
3. Step 3: Cross multiply
   784.31x = 1,081.59 × 679.34
4. Step 4: Simplify right side
   784.31x = 734,761.94
5. Step 5: Solve for x
   x = 734,761.94/784.31
6. Step 6: Final answer
   x = 936.83