Finding the Fourth Proportional to 12,225.42, 18,327.87 and 8,516.70

Step by Step Solution

1. Step 1: Write the proportion equation
   12,225.42 : 18,327.87 = 8,516.70 : x
2. Step 2: Convert to fraction form
   12,225.42/18,327.87 = 8,516.70/x
3. Step 3: Cross multiply
   12,225.42x = 18,327.87 × 8,516.70
4. Step 4: Simplify right side
   12,225.42x = 156,092,970.43
5. Step 5: Solve for x
   x = 156,092,970.43/12,225.42
6. Step 6: Final answer
   x = 12,767.90