Finding the Fourth Proportional to 15,072.72, 20,801.16 and 8,784.72

Step by Step Solution

1. Step 1: Write the proportion equation
   15,072.72 : 20,801.16 = 8,784.72 : x
2. Step 2: Convert to fraction form
   15,072.72/20,801.16 = 8,784.72/x
3. Step 3: Cross multiply
   15,072.72x = 20,801.16 × 8,784.72
4. Step 4: Simplify right side
   15,072.72x = 182,732,366.28
5. Step 5: Solve for x
   x = 182,732,366.28/15,072.72
6. Step 6: Final answer
   x = 12,123.38