Finding the Fourth Proportional to 13,821.54, 19,076.82 and 8,784.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,821.54 : 19,076.82 = 8,784.78 : x
2. Step 2: Convert to fraction form
   13,821.54/19,076.82 = 8,784.78/x
3. Step 3: Cross multiply
   13,821.54x = 19,076.82 × 8,784.78
4. Step 4: Simplify right side
   13,821.54x = 167,585,666.80
5. Step 5: Solve for x
   x = 167,585,666.80/13,821.54
6. Step 6: Final answer
   x = 12,124.96