Finding the Fourth Proportional to 21,978.16, 30,322.68 and 12,544.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,978.16 : 30,322.68 = 12,544.88 : x
2. Step 2: Convert to fraction form
   21,978.16/30,322.68 = 12,544.88/x
3. Step 3: Cross multiply
   21,978.16x = 30,322.68 × 12,544.88
4. Step 4: Simplify right side
   21,978.16x = 380,394,381.88
5. Step 5: Solve for x
   x = 380,394,381.88/21,978.16
6. Step 6: Final answer
   x = 17,307.84