Finding the Fourth Proportional to 4,976.79, 7,467.62 and 3,128.78

Step by Step Solution

1. Step 1: Write the proportion equation
   4,976.79 : 7,467.62 = 3,128.78 : x
2. Step 2: Convert to fraction form
   4,976.79/7,467.62 = 3,128.78/x
3. Step 3: Cross multiply
   4,976.79x = 7,467.62 × 3,128.78
4. Step 4: Simplify right side
   4,976.79x = 23,364,509.92
5. Step 5: Solve for x
   x = 23,364,509.92/4,976.79
6. Step 6: Final answer
   x = 4,694.69