Finding the Fourth Proportional to 20,859.63, 31,293.53 and 9,172.82

Step by Step Solution

1. Step 1: Write the proportion equation
   20,859.63 : 31,293.53 = 9,172.82 : x
2. Step 2: Convert to fraction form
   20,859.63/31,293.53 = 9,172.82/x
3. Step 3: Cross multiply
   20,859.63x = 31,293.53 × 9,172.82
4. Step 4: Simplify right side
   20,859.63x = 287,049,715.52
5. Step 5: Solve for x
   x = 287,049,715.52/20,859.63
6. Step 6: Final answer
   x = 13,761.02