Finding the Fourth Proportional to 21,910.76, 30,233.70 and 12,477.80

Step by Step Solution

1. Step 1: Write the proportion equation
   21,910.76 : 30,233.70 = 12,477.80 : x
2. Step 2: Convert to fraction form
   21,910.76/30,233.70 = 12,477.80/x
3. Step 3: Cross multiply
   21,910.76x = 30,233.70 × 12,477.80
4. Step 4: Simplify right side
   21,910.76x = 377,250,061.86
5. Step 5: Solve for x
   x = 377,250,061.86/21,910.76
6. Step 6: Final answer
   x = 17,217.57