Finding the Fourth Proportional to 11,897.04, 17,854.56 and 8,139.86

Step by Step Solution

1. Step 1: Write the proportion equation
   11,897.04 : 17,854.56 = 8,139.86 : x
2. Step 2: Convert to fraction form
   11,897.04/17,854.56 = 8,139.86/x
3. Step 3: Cross multiply
   11,897.04x = 17,854.56 × 8,139.86
4. Step 4: Simplify right side
   11,897.04x = 145,333,596.44
5. Step 5: Solve for x
   x = 145,333,596.44/11,897.04
6. Step 6: Final answer
   x = 12,215.94