Finding the Fourth Proportional to 12,665.72, 17,478.65 and 7,076.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,665.72 : 17,478.65 = 7,076.72 : x
2. Step 2: Convert to fraction form
   12,665.72/17,478.65 = 7,076.72/x
3. Step 3: Cross multiply
   12,665.72x = 17,478.65 × 7,076.72
4. Step 4: Simplify right side
   12,665.72x = 123,691,389.25
5. Step 5: Solve for x
   x = 123,691,389.25/12,665.72
6. Step 6: Final answer
   x = 9,765.84