Finding the Fourth Proportional to 5,128.46, 7,693.90 and 1,665.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,128.46 : 7,693.90 = 1,665.72 : x
2. Step 2: Convert to fraction form
   5,128.46/7,693.90 = 1,665.72/x
3. Step 3: Cross multiply
   5,128.46x = 7,693.90 × 1,665.72
4. Step 4: Simplify right side
   5,128.46x = 12,815,883.11
5. Step 5: Solve for x
   x = 12,815,883.11/5,128.46
6. Step 6: Final answer
   x = 2,498.97