Finding the Fourth Proportional to 13,170.76, 18,175.94 and 7,864.59

Step by Step Solution

1. Step 1: Write the proportion equation
   13,170.76 : 18,175.94 = 7,864.59 : x
2. Step 2: Convert to fraction form
   13,170.76/18,175.94 = 7,864.59/x
3. Step 3: Cross multiply
   13,170.76x = 18,175.94 × 7,864.59
4. Step 4: Simplify right side
   13,170.76x = 142,946,315.96
5. Step 5: Solve for x
   x = 142,946,315.96/13,170.76
6. Step 6: Final answer
   x = 10,853.31