Finding the Fourth Proportional to 18,956.72, 28,440.55 and 7,861.34

Step by Step Solution

1. Step 1: Write the proportion equation
   18,956.72 : 28,440.55 = 7,861.34 : x
2. Step 2: Convert to fraction form
   18,956.72/28,440.55 = 7,861.34/x
3. Step 3: Cross multiply
   18,956.72x = 28,440.55 × 7,861.34
4. Step 4: Simplify right side
   18,956.72x = 223,580,833.34
5. Step 5: Solve for x
   x = 223,580,833.34/18,956.72
6. Step 6: Final answer
   x = 11,794.28