Finding the Fourth Proportional to 13,171.98, 18,160.56 and 7,864.86

Step by Step Solution

1. Step 1: Write the proportion equation
   13,171.98 : 18,160.56 = 7,864.86 : x
2. Step 2: Convert to fraction form
   13,171.98/18,160.56 = 7,864.86/x
3. Step 3: Cross multiply
   13,171.98x = 18,160.56 × 7,864.86
4. Step 4: Simplify right side
   13,171.98x = 142,830,261.92
5. Step 5: Solve for x
   x = 142,830,261.92/13,171.98
6. Step 6: Final answer
   x = 10,843.49