Finding the Fourth Proportional to 13,612.46, 18,784.71 and 7,644.38

Step by Step Solution

1. Step 1: Write the proportion equation
   13,612.46 : 18,784.71 = 7,644.38 : x
2. Step 2: Convert to fraction form
   13,612.46/18,784.71 = 7,644.38/x
3. Step 3: Cross multiply
   13,612.46x = 18,784.71 × 7,644.38
4. Step 4: Simplify right side
   13,612.46x = 143,597,508.39
5. Step 5: Solve for x
   x = 143,597,508.39/13,612.46
6. Step 6: Final answer
   x = 10,548.97