Finding the Fourth Proportional to 13,404.86, 18,499.54 and 7,740.66

Step by Step Solution

1. Step 1: Write the proportion equation
   13,404.86 : 18,499.54 = 7,740.66 : x
2. Step 2: Convert to fraction form
   13,404.86/18,499.54 = 7,740.66/x
3. Step 3: Cross multiply
   13,404.86x = 18,499.54 × 7,740.66
4. Step 4: Simplify right side
   13,404.86x = 143,198,649.30
5. Step 5: Solve for x
   x = 143,198,649.30/13,404.86
6. Step 6: Final answer
   x = 10,682.59