Finding the Fourth Proportional to 13,410.94, 18,507.22 and 8,109.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,410.94 : 18,507.22 = 8,109.30 : x
2. Step 2: Convert to fraction form
   13,410.94/18,507.22 = 8,109.30/x
3. Step 3: Cross multiply
   13,410.94x = 18,507.22 × 8,109.30
4. Step 4: Simplify right side
   13,410.94x = 150,080,599.15
5. Step 5: Solve for x
   x = 150,080,599.15/13,410.94
6. Step 6: Final answer
   x = 11,190.91