Finding the Fourth Proportional to 5,175.47, 7,764.50 and 1,665.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,175.47 : 7,764.50 = 1,665.78 : x
2. Step 2: Convert to fraction form
   5,175.47/7,764.50 = 1,665.78/x
3. Step 3: Cross multiply
   5,175.47x = 7,764.50 × 1,665.78
4. Step 4: Simplify right side
   5,175.47x = 12,933,948.81
5. Step 5: Solve for x
   x = 12,933,948.81/5,175.47
6. Step 6: Final answer
   x = 2,499.09