Finding the Fourth Proportional to 6,519.64, 8,997.43 and 4,128.72

Step by Step Solution

1. Step 1: Write the proportion equation
   6,519.64 : 8,997.43 = 4,128.72 : x
2. Step 2: Convert to fraction form
   6,519.64/8,997.43 = 4,128.72/x
3. Step 3: Cross multiply
   6,519.64x = 8,997.43 × 4,128.72
4. Step 4: Simplify right side
   6,519.64x = 37,147,883.48
5. Step 5: Solve for x
   x = 37,147,883.48/6,519.64
6. Step 6: Final answer
   x = 5,697.84