Finding the Fourth Proportional to 2,185.10, 3,013.47 and 1,438.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.10 : 3,013.47 = 1,438.78 : x
2. Step 2: Convert to fraction form
   2,185.10/3,013.47 = 1,438.78/x
3. Step 3: Cross multiply
   2,185.10x = 3,013.47 × 1,438.78
4. Step 4: Simplify right side
   2,185.10x = 4,335,720.37
5. Step 5: Solve for x
   x = 4,335,720.37/2,185.10
6. Step 6: Final answer
   x = 1,984.22