Finding the Fourth Proportional to 12,636.64, 17,421.60 and 8,854.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,636.64 : 17,421.60 = 8,854.72 : x
2. Step 2: Convert to fraction form
   12,636.64/17,421.60 = 8,854.72/x
3. Step 3: Cross multiply
   12,636.64x = 17,421.60 × 8,854.72
4. Step 4: Simplify right side
   12,636.64x = 154,263,389.95
5. Step 5: Solve for x
   x = 154,263,389.95/12,636.64
6. Step 6: Final answer
   x = 12,207.63