Finding the Fourth Proportional to 2,780.24, 4,167.12 and 1,238

Step by Step Solution

1. Step 1: Write the proportion equation
   2,780.24 : 4,167.12 = 1,238 : x
2. Step 2: Convert to fraction form
   2,780.24/4,167.12 = 1,238/x
3. Step 3: Cross multiply
   2,780.24x = 4,167.12 × 1,238
4. Step 4: Simplify right side
   2,780.24x = 5,158,894.56
5. Step 5: Solve for x
   x = 5,158,894.56/2,780.24
6. Step 6: Final answer
   x = 1,855.56