Finding the Fourth Proportional to 21,656.72, 29,885.95 and 12,096.78

Step by Step Solution

1. Step 1: Write the proportion equation
   21,656.72 : 29,885.95 = 12,096.78 : x
2. Step 2: Convert to fraction form
   21,656.72/29,885.95 = 12,096.78/x
3. Step 3: Cross multiply
   21,656.72x = 29,885.95 × 12,096.78
4. Step 4: Simplify right side
   21,656.72x = 361,523,597.25
5. Step 5: Solve for x
   x = 361,523,597.25/21,656.72
6. Step 6: Final answer
   x = 16,693.37