Finding the Fourth Proportional to 21,061.44, 29,066.32 and 12,111.76

Step by Step Solution

1. Step 1: Write the proportion equation
   21,061.44 : 29,066.32 = 12,111.76 : x
2. Step 2: Convert to fraction form
   21,061.44/29,066.32 = 12,111.76/x
3. Step 3: Cross multiply
   21,061.44x = 29,066.32 × 12,111.76
4. Step 4: Simplify right side
   21,061.44x = 352,044,291.92
5. Step 5: Solve for x
   x = 352,044,291.92/21,061.44
6. Step 6: Final answer
   x = 16,715.11