Finding the Fourth Proportional to 10,857.98, 14,981.69 and 8,172.02

Step by Step Solution

1. Step 1: Write the proportion equation
   10,857.98 : 14,981.69 = 8,172.02 : x
2. Step 2: Convert to fraction form
   10,857.98/14,981.69 = 8,172.02/x
3. Step 3: Cross multiply
   10,857.98x = 14,981.69 × 8,172.02
4. Step 4: Simplify right side
   10,857.98x = 122,430,728.20
5. Step 5: Solve for x
   x = 122,430,728.20/10,857.98
6. Step 6: Final answer
   x = 11,275.64