Finding the Fourth Proportional to 2,139.53, 3,210.91 and 1,444.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.53 : 3,210.91 = 1,444.55 : x
2. Step 2: Convert to fraction form
   2,139.53/3,210.91 = 1,444.55/x
3. Step 3: Cross multiply
   2,139.53x = 3,210.91 × 1,444.55
4. Step 4: Simplify right side
   2,139.53x = 4,638,300.37
5. Step 5: Solve for x
   x = 4,638,300.37/2,139.53
6. Step 6: Final answer
   x = 2,167.91