Finding the Fourth Proportional to 8,979.18, 12,389.16 and 5,442.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,979.18 : 12,389.16 = 5,442.30 : x
2. Step 2: Convert to fraction form
   8,979.18/12,389.16 = 5,442.30/x
3. Step 3: Cross multiply
   8,979.18x = 12,389.16 × 5,442.30
4. Step 4: Simplify right side
   8,979.18x = 67,425,525.47
5. Step 5: Solve for x
   x = 67,425,525.47/8,979.18
6. Step 6: Final answer
   x = 7,509.10