Finding the Fourth Proportional to 1,443.79, 2,165.69 and 1,238.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.79 : 2,165.69 = 1,238.05 : x
2. Step 2: Convert to fraction form
   1,443.79/2,165.69 = 1,238.05/x
3. Step 3: Cross multiply
   1,443.79x = 2,165.69 × 1,238.05
4. Step 4: Simplify right side
   1,443.79x = 2,681,232.50
5. Step 5: Solve for x
   x = 2,681,232.50/1,443.79
6. Step 6: Final answer
   x = 1,857.08