Finding the Fourth Proportional to 12,661.34, 18,981.83 and 8,700.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,661.34 : 18,981.83 = 8,700.86 : x
2. Step 2: Convert to fraction form
   12,661.34/18,981.83 = 8,700.86/x
3. Step 3: Cross multiply
   12,661.34x = 18,981.83 × 8,700.86
4. Step 4: Simplify right side
   12,661.34x = 165,158,245.37
5. Step 5: Solve for x
   x = 165,158,245.37/12,661.34
6. Step 6: Final answer
   x = 13,044.29