Finding the Fourth Proportional to 22,196.64, 30,628.80 and 12,768.24

Step by Step Solution

1. Step 1: Write the proportion equation
   22,196.64 : 30,628.80 = 12,768.24 : x
2. Step 2: Convert to fraction form
   22,196.64/30,628.80 = 12,768.24/x
3. Step 3: Cross multiply
   22,196.64x = 30,628.80 × 12,768.24
4. Step 4: Simplify right side
   22,196.64x = 391,075,869.31
5. Step 5: Solve for x
   x = 391,075,869.31/22,196.64
6. Step 6: Final answer
   x = 17,618.70