Finding the Fourth Proportional to 2,799.55, 4,198.67 and 1,238.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,799.55 : 4,198.67 = 1,238.70 : x
2. Step 2: Convert to fraction form
   2,799.55/4,198.67 = 1,238.70/x
3. Step 3: Cross multiply
   2,799.55x = 4,198.67 × 1,238.70
4. Step 4: Simplify right side
   2,799.55x = 5,200,886.34
5. Step 5: Solve for x
   x = 5,200,886.34/2,799.55
6. Step 6: Final answer
   x = 1,857.76