Finding the Fourth Proportional to 12,807.56, 17,674.57 and 7,218.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,807.56 : 17,674.57 = 7,218.56 : x
2. Step 2: Convert to fraction form
   12,807.56/17,674.57 = 7,218.56/x
3. Step 3: Cross multiply
   12,807.56x = 17,674.57 × 7,218.56
4. Step 4: Simplify right side
   12,807.56x = 127,584,997.23
5. Step 5: Solve for x
   x = 127,584,997.23/12,807.56
6. Step 6: Final answer
   x = 9,961.69