Finding the Fourth Proportional to 2,665.90, 3,997.48 and 1,434.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,665.90 : 3,997.48 = 1,434.35 : x
2. Step 2: Convert to fraction form
   2,665.90/3,997.48 = 1,434.35/x
3. Step 3: Cross multiply
   2,665.90x = 3,997.48 × 1,434.35
4. Step 4: Simplify right side
   2,665.90x = 5,733,785.44
5. Step 5: Solve for x
   x = 5,733,785.44/2,665.90
6. Step 6: Final answer
   x = 2,150.79