Finding the Fourth Proportional to 1,071.88, 1,479.46 and 606.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.88 : 1,479.46 = 606.40 : x
2. Step 2: Convert to fraction form
   1,071.88/1,479.46 = 606.40/x
3. Step 3: Cross multiply
   1,071.88x = 1,479.46 × 606.40
4. Step 4: Simplify right side
   1,071.88x = 897,144.54
5. Step 5: Solve for x
   x = 897,144.54/1,071.88
6. Step 6: Final answer
   x = 836.98