Finding the Fourth Proportional to 10,978.16, 16,467.18 and 4,399.64

Step by Step Solution

1. Step 1: Write the proportion equation
   10,978.16 : 16,467.18 = 4,399.64 : x
2. Step 2: Convert to fraction form
   10,978.16/16,467.18 = 4,399.64/x
3. Step 3: Cross multiply
   10,978.16x = 16,467.18 × 4,399.64
4. Step 4: Simplify right side
   10,978.16x = 72,449,663.82
5. Step 5: Solve for x
   x = 72,449,663.82/10,978.16
6. Step 6: Final answer
   x = 6,599.44