Finding the Fourth Proportional to 3,188.48, 4,780.87 and 1,238.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,188.48 : 4,780.87 = 1,238.42 : x
2. Step 2: Convert to fraction form
   3,188.48/4,780.87 = 1,238.42/x
3. Step 3: Cross multiply
   3,188.48x = 4,780.87 × 1,238.42
4. Step 4: Simplify right side
   3,188.48x = 5,920,725.03
5. Step 5: Solve for x
   x = 5,920,725.03/3,188.48
6. Step 6: Final answer
   x = 1,856.91