Finding the Fourth Proportional to 5,131.72, 7,697.76 and 1,669

Step by Step Solution

1. Step 1: Write the proportion equation
   5,131.72 : 7,697.76 = 1,669 : x
2. Step 2: Convert to fraction form
   5,131.72/7,697.76 = 1,669/x
3. Step 3: Cross multiply
   5,131.72x = 7,697.76 × 1,669
4. Step 4: Simplify right side
   5,131.72x = 12,847,561.44
5. Step 5: Solve for x
   x = 12,847,561.44/5,131.72
6. Step 6: Final answer
   x = 2,503.56