Finding the Fourth Proportional to 1,071.28, 1,479.42 and 740.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.28 : 1,479.42 = 740.56 : x
2. Step 2: Convert to fraction form
   1,071.28/1,479.42 = 740.56/x
3. Step 3: Cross multiply
   1,071.28x = 1,479.42 × 740.56
4. Step 4: Simplify right side
   1,071.28x = 1,095,599.28
5. Step 5: Solve for x
   x = 1,095,599.28/1,071.28
6. Step 6: Final answer
   x = 1,022.70