Finding the Fourth Proportional to 21,830.56, 30,126.78 and 12,877.24

Step by Step Solution

1. Step 1: Write the proportion equation
   21,830.56 : 30,126.78 = 12,877.24 : x
2. Step 2: Convert to fraction form
   21,830.56/30,126.78 = 12,877.24/x
3. Step 3: Cross multiply
   21,830.56x = 30,126.78 × 12,877.24
4. Step 4: Simplify right side
   21,830.56x = 387,949,776.49
5. Step 5: Solve for x
   x = 387,949,776.49/21,830.56
6. Step 6: Final answer
   x = 17,770.95