Finding the Fourth Proportional to 8,978.84, 12,389.88 and 5,203.24

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.84 : 12,389.88 = 5,203.24 : x
2. Step 2: Convert to fraction form
   8,978.84/12,389.88 = 5,203.24/x
3. Step 3: Cross multiply
   8,978.84x = 12,389.88 × 5,203.24
4. Step 4: Simplify right side
   8,978.84x = 64,467,519.21
5. Step 5: Solve for x
   x = 64,467,519.21/8,978.84
6. Step 6: Final answer
   x = 7,179.94