Finding the Fourth Proportional to 13,416.72, 18,513.60 and 7,674.24

Step by Step Solution

1. Step 1: Write the proportion equation
   13,416.72 : 18,513.60 = 7,674.24 : x
2. Step 2: Convert to fraction form
   13,416.72/18,513.60 = 7,674.24/x
3. Step 3: Cross multiply
   13,416.72x = 18,513.60 × 7,674.24
4. Step 4: Simplify right side
   13,416.72x = 142,077,809.66
5. Step 5: Solve for x
   x = 142,077,809.66/13,416.72
6. Step 6: Final answer
   x = 10,589.61