Finding the Fourth Proportional to 13,436.27, 20,126.69 and 7,872.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,436.27 : 20,126.69 = 7,872.72 : x
2. Step 2: Convert to fraction form
   13,436.27/20,126.69 = 7,872.72/x
3. Step 3: Cross multiply
   13,436.27x = 20,126.69 × 7,872.72
4. Step 4: Simplify right side
   13,436.27x = 158,451,755.53
5. Step 5: Solve for x
   x = 158,451,755.53/13,436.27
6. Step 6: Final answer
   x = 11,792.84