Finding the Fourth Proportional to 13,168.98, 18,156.42 and 7,861.86

Step by Step Solution

1. Step 1: Write the proportion equation
   13,168.98 : 18,156.42 = 7,861.86 : x
2. Step 2: Convert to fraction form
   13,168.98/18,156.42 = 7,861.86/x
3. Step 3: Cross multiply
   13,168.98x = 18,156.42 × 7,861.86
4. Step 4: Simplify right side
   13,168.98x = 142,743,232.14
5. Step 5: Solve for x
   x = 142,743,232.14/13,168.98
6. Step 6: Final answer
   x = 10,839.35