Finding the Fourth Proportional to 13,308.47, 19,929.89 and 8,365.85

Step by Step Solution

1. Step 1: Write the proportion equation
   13,308.47 : 19,929.89 = 8,365.85 : x
2. Step 2: Convert to fraction form
   13,308.47/19,929.89 = 8,365.85/x
3. Step 3: Cross multiply
   13,308.47x = 19,929.89 × 8,365.85
4. Step 4: Simplify right side
   13,308.47x = 166,730,391.52
5. Step 5: Solve for x
   x = 166,730,391.52/13,308.47
6. Step 6: Final answer
   x = 12,528.15