Finding the Fourth Proportional to 4,443.12, 6,128.28 and 3,118.32

Step by Step Solution

1. Step 1: Write the proportion equation
   4,443.12 : 6,128.28 = 3,118.32 : x
2. Step 2: Convert to fraction form
   4,443.12/6,128.28 = 3,118.32/x
3. Step 3: Cross multiply
   4,443.12x = 6,128.28 × 3,118.32
4. Step 4: Simplify right side
   4,443.12x = 19,109,938.09
5. Step 5: Solve for x
   x = 19,109,938.09/4,443.12
6. Step 6: Final answer
   x = 4,301.02