Finding the Fourth Proportional to 3,189.78, 4,432.23 and 3,155.54

Step by Step Solution

1. Step 1: Write the proportion equation
   3,189.78 : 4,432.23 = 3,155.54 : x
2. Step 2: Convert to fraction form
   3,189.78/4,432.23 = 3,155.54/x
3. Step 3: Cross multiply
   3,189.78x = 4,432.23 × 3,155.54
4. Step 4: Simplify right side
   3,189.78x = 13,986,056.89
5. Step 5: Solve for x
   x = 13,986,056.89/3,189.78
6. Step 6: Final answer
   x = 4,384.65