Finding the Fourth Proportional to 13,691.86, 18,894.77 and 7,404.23

Step by Step Solution

1. Step 1: Write the proportion equation
   13,691.86 : 18,894.77 = 7,404.23 : x
2. Step 2: Convert to fraction form
   13,691.86/18,894.77 = 7,404.23/x
3. Step 3: Cross multiply
   13,691.86x = 18,894.77 × 7,404.23
4. Step 4: Simplify right side
   13,691.86x = 139,901,222.88
5. Step 5: Solve for x
   x = 139,901,222.88/13,691.86
6. Step 6: Final answer
   x = 10,217.84