Finding the Fourth Proportional to 2,075.72, 3,114.72 and 921.44

Step by Step Solution

1. Step 1: Write the proportion equation
   2,075.72 : 3,114.72 = 921.44 : x
2. Step 2: Convert to fraction form
   2,075.72/3,114.72 = 921.44/x
3. Step 3: Cross multiply
   2,075.72x = 3,114.72 × 921.44
4. Step 4: Simplify right side
   2,075.72x = 2,870,027.60
5. Step 5: Solve for x
   x = 2,870,027.60/2,075.72
6. Step 6: Final answer
   x = 1,382.67