Finding the Fourth Proportional to 12,158.34, 18,230.55 and 7,231.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,158.34 : 18,230.55 = 7,231.42 : x
2. Step 2: Convert to fraction form
   12,158.34/18,230.55 = 7,231.42/x
3. Step 3: Cross multiply
   12,158.34x = 18,230.55 × 7,231.42
4. Step 4: Simplify right side
   12,158.34x = 131,832,763.88
5. Step 5: Solve for x
   x = 131,832,763.88/12,158.34
6. Step 6: Final answer
   x = 10,842.99