Finding the Fourth Proportional to 13,404.36, 18,498.86 and 7,740.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,404.36 : 18,498.86 = 7,740.15 : x
2. Step 2: Convert to fraction form
   13,404.36/18,498.86 = 7,740.15/x
3. Step 3: Cross multiply
   13,404.36x = 18,498.86 × 7,740.15
4. Step 4: Simplify right side
   13,404.36x = 143,183,912.53
5. Step 5: Solve for x
   x = 143,183,912.53/13,404.36
6. Step 6: Final answer
   x = 10,681.89