Finding the Fourth Proportional to 13,426.56, 18,530.78 and 8,645.13

Step by Step Solution

1. Step 1: Write the proportion equation
   13,426.56 : 18,530.78 = 8,645.13 : x
2. Step 2: Convert to fraction form
   13,426.56/18,530.78 = 8,645.13/x
3. Step 3: Cross multiply
   13,426.56x = 18,530.78 × 8,645.13
4. Step 4: Simplify right side
   13,426.56x = 160,200,958.88
5. Step 5: Solve for x
   x = 160,200,958.88/13,426.56
6. Step 6: Final answer
   x = 11,931.65