Finding the Fourth Proportional to 5,222.40, 7,880.12 and 5,019.88

Step by Step Solution

1. Step 1: Write the proportion equation
   5,222.40 : 7,880.12 = 5,019.88 : x
2. Step 2: Convert to fraction form
   5,222.40/7,880.12 = 5,019.88/x
3. Step 3: Cross multiply
   5,222.40x = 7,880.12 × 5,019.88
4. Step 4: Simplify right side
   5,222.40x = 39,557,256.79
5. Step 5: Solve for x
   x = 39,557,256.79/5,222.40
6. Step 6: Final answer
   x = 7,574.54