Finding the Fourth Proportional to 12,789.51, 17,644.64 and 8,007.47

Step by Step Solution

1. Step 1: Write the proportion equation
   12,789.51 : 17,644.64 = 8,007.47 : x
2. Step 2: Convert to fraction form
   12,789.51/17,644.64 = 8,007.47/x
3. Step 3: Cross multiply
   12,789.51x = 17,644.64 × 8,007.47
4. Step 4: Simplify right side
   12,789.51x = 141,288,962.62
5. Step 5: Solve for x
   x = 141,288,962.62/12,789.51
6. Step 6: Final answer
   x = 11,047.25