Finding the Fourth Proportional to 13,416.27, 18,513.53 and 7,447.47

Step by Step Solution

1. Step 1: Write the proportion equation
   13,416.27 : 18,513.53 = 7,447.47 : x
2. Step 2: Convert to fraction form
   13,416.27/18,513.53 = 7,447.47/x
3. Step 3: Cross multiply
   13,416.27x = 18,513.53 × 7,447.47
4. Step 4: Simplify right side
   13,416.27x = 137,878,949.96
5. Step 5: Solve for x
   x = 137,878,949.96/13,416.27
6. Step 6: Final answer
   x = 10,276.99