Finding the Fourth Proportional to 1,069.92, 1,485.72 and 1,061.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,069.92 : 1,485.72 = 1,061.28 : x
2. Step 2: Convert to fraction form
   1,069.92/1,485.72 = 1,061.28/x
3. Step 3: Cross multiply
   1,069.92x = 1,485.72 × 1,061.28
4. Step 4: Simplify right side
   1,069.92x = 1,576,764.92
5. Step 5: Solve for x
   x = 1,576,764.92/1,069.92
6. Step 6: Final answer
   x = 1,473.72