Finding the Fourth Proportional to 5,119.59, 7,063.50 and 3,128.06

Step by Step Solution

1. Step 1: Write the proportion equation
   5,119.59 : 7,063.50 = 3,128.06 : x
2. Step 2: Convert to fraction form
   5,119.59/7,063.50 = 3,128.06/x
3. Step 3: Cross multiply
   5,119.59x = 7,063.50 × 3,128.06
4. Step 4: Simplify right side
   5,119.59x = 22,095,016.49
5. Step 5: Solve for x
   x = 22,095,016.49/5,119.59
6. Step 6: Final answer
   x = 4,315.78