Finding the Fourth Proportional to 13,707.84, 20,514.24 and 8,440.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,707.84 : 20,514.24 = 8,440.50 : x
2. Step 2: Convert to fraction form
   13,707.84/20,514.24 = 8,440.50/x
3. Step 3: Cross multiply
   13,707.84x = 20,514.24 × 8,440.50
4. Step 4: Simplify right side
   13,707.84x = 173,150,442.72
5. Step 5: Solve for x
   x = 173,150,442.72/13,707.84
6. Step 6: Final answer
   x = 12,631.49