Finding the Fourth Proportional to 4,778.32, 7,168.76 and 4,321.36

Step by Step Solution

1. Step 1: Write the proportion equation
   4,778.32 : 7,168.76 = 4,321.36 : x
2. Step 2: Convert to fraction form
   4,778.32/7,168.76 = 4,321.36/x
3. Step 3: Cross multiply
   4,778.32x = 7,168.76 × 4,321.36
4. Step 4: Simplify right side
   4,778.32x = 30,978,792.71
5. Step 5: Solve for x
   x = 30,978,792.71/4,778.32
6. Step 6: Final answer
   x = 6,483.20