Finding the Fourth Proportional to 21,654.72, 29,883.52 and 12,225.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,654.72 : 29,883.52 = 12,225.28 : x
2. Step 2: Convert to fraction form
   21,654.72/29,883.52 = 12,225.28/x
3. Step 3: Cross multiply
   21,654.72x = 29,883.52 × 12,225.28
4. Step 4: Simplify right side
   21,654.72x = 365,334,399.39
5. Step 5: Solve for x
   x = 365,334,399.39/21,654.72
6. Step 6: Final answer
   x = 16,870.89