Finding the Fourth Proportional to 3,019.75, 4,530.06 and 939.90

Step by Step Solution

1. Step 1: Write the proportion equation
   3,019.75 : 4,530.06 = 939.90 : x
2. Step 2: Convert to fraction form
   3,019.75/4,530.06 = 939.90/x
3. Step 3: Cross multiply
   3,019.75x = 4,530.06 × 939.90
4. Step 4: Simplify right side
   3,019.75x = 4,257,820.38
5. Step 5: Solve for x
   x = 4,257,820.38/3,019.75
6. Step 6: Final answer
   x = 1,409.99