Finding the Fourth Proportional to 13,127.86, 18,111.09 and 8,020.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,127.86 : 18,111.09 = 8,020.72 : x
2. Step 2: Convert to fraction form
   13,127.86/18,111.09 = 8,020.72/x
3. Step 3: Cross multiply
   13,127.86x = 18,111.09 × 8,020.72
4. Step 4: Simplify right side
   13,127.86x = 145,263,981.78
5. Step 5: Solve for x
   x = 145,263,981.78/13,127.86
6. Step 6: Final answer
   x = 11,065.32