Finding the Fourth Proportional to 1,439.45, 1,977.84 and 1,144.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.45 : 1,977.84 = 1,144.21 : x
2. Step 2: Convert to fraction form
   1,439.45/1,977.84 = 1,144.21/x
3. Step 3: Cross multiply
   1,439.45x = 1,977.84 × 1,144.21
4. Step 4: Simplify right side
   1,439.45x = 2,263,064.31
5. Step 5: Solve for x
   x = 2,263,064.31/1,439.45
6. Step 6: Final answer
   x = 1,572.17