Finding the Fourth Proportional to 2,139.40, 3,210.72 and 1,444.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.40 : 3,210.72 = 1,444.42 : x
2. Step 2: Convert to fraction form
   2,139.40/3,210.72 = 1,444.42/x
3. Step 3: Cross multiply
   2,139.40x = 3,210.72 × 1,444.42
4. Step 4: Simplify right side
   2,139.40x = 4,637,628.18
5. Step 5: Solve for x
   x = 4,637,628.18/2,139.40
6. Step 6: Final answer
   x = 2,167.72