Finding the Fourth Proportional to 1,071.48, 1,480.69 and 773.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.48 : 1,480.69 = 773.71 : x
2. Step 2: Convert to fraction form
   1,071.48/1,480.69 = 773.71/x
3. Step 3: Cross multiply
   1,071.48x = 1,480.69 × 773.71
4. Step 4: Simplify right side
   1,071.48x = 1,145,624.66
5. Step 5: Solve for x
   x = 1,145,624.66/1,071.48
6. Step 6: Final answer
   x = 1,069.20