Finding the Fourth Proportional to 13,394.89, 18,484.79 and 7,729.57

Step by Step Solution

1. Step 1: Write the proportion equation
   13,394.89 : 18,484.79 = 7,729.57 : x
2. Step 2: Convert to fraction form
   13,394.89/18,484.79 = 7,729.57/x
3. Step 3: Cross multiply
   13,394.89x = 18,484.79 × 7,729.57
4. Step 4: Simplify right side
   13,394.89x = 142,879,439.59
5. Step 5: Solve for x
   x = 142,879,439.59/13,394.89
6. Step 6: Final answer
   x = 10,666.71