Finding the Fourth Proportional to 13,167.51, 18,171.45 and 7,861.34

Step by Step Solution

1. Step 1: Write the proportion equation
   13,167.51 : 18,171.45 = 7,861.34 : x
2. Step 2: Convert to fraction form
   13,167.51/18,171.45 = 7,861.34/x
3. Step 3: Cross multiply
   13,167.51x = 18,171.45 × 7,861.34
4. Step 4: Simplify right side
   13,167.51x = 142,851,855.89
5. Step 5: Solve for x
   x = 142,851,855.89/13,167.51
6. Step 6: Final answer
   x = 10,848.81