Finding the Fourth Proportional to 1,311.69, 1,812.73 and 1,075.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,311.69 : 1,812.73 = 1,075.28 : x
2. Step 2: Convert to fraction form
   1,311.69/1,812.73 = 1,075.28/x
3. Step 3: Cross multiply
   1,311.69x = 1,812.73 × 1,075.28
4. Step 4: Simplify right side
   1,311.69x = 1,949,185.98
5. Step 5: Solve for x
   x = 1,949,185.98/1,311.69
6. Step 6: Final answer
   x = 1,486.01