Finding the Fourth Proportional to 21,978.24, 30,331.92 and 12,549.84

Step by Step Solution

1. Step 1: Write the proportion equation
   21,978.24 : 30,331.92 = 12,549.84 : x
2. Step 2: Convert to fraction form
   21,978.24/30,331.92 = 12,549.84/x
3. Step 3: Cross multiply
   21,978.24x = 30,331.92 × 12,549.84
4. Step 4: Simplify right side
   21,978.24x = 380,660,742.89
5. Step 5: Solve for x
   x = 380,660,742.89/21,978.24
6. Step 6: Final answer
   x = 17,319.89