Finding the Fourth Proportional to 3,187.89, 4,780.47 and 1,238.73

Step by Step Solution

1. Step 1: Write the proportion equation
   3,187.89 : 4,780.47 = 1,238.73 : x
2. Step 2: Convert to fraction form
   3,187.89/4,780.47 = 1,238.73/x
3. Step 3: Cross multiply
   3,187.89x = 4,780.47 × 1,238.73
4. Step 4: Simplify right side
   3,187.89x = 5,921,719.36
5. Step 5: Solve for x
   x = 5,921,719.36/3,187.89
6. Step 6: Final answer
   x = 1,857.56