Finding the Fourth Proportional to 12,789.60, 17,649.44 and 7,200.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,789.60 : 17,649.44 = 7,200.56 : x
2. Step 2: Convert to fraction form
   12,789.60/17,649.44 = 7,200.56/x
3. Step 3: Cross multiply
   12,789.60x = 17,649.44 × 7,200.56
4. Step 4: Simplify right side
   12,789.60x = 127,085,851.69
5. Step 5: Solve for x
   x = 127,085,851.69/12,789.60
6. Step 6: Final answer
   x = 9,936.66