Finding the Fourth Proportional to 12,391.88, 17,096.31 and 8,145.27

Step by Step Solution

1. Step 1: Write the proportion equation
   12,391.88 : 17,096.31 = 8,145.27 : x
2. Step 2: Convert to fraction form
   12,391.88/17,096.31 = 8,145.27/x
3. Step 3: Cross multiply
   12,391.88x = 17,096.31 × 8,145.27
4. Step 4: Simplify right side
   12,391.88x = 139,254,060.95
5. Step 5: Solve for x
   x = 139,254,060.95/12,391.88
6. Step 6: Final answer
   x = 11,237.53