Finding the Fourth Proportional to 2,120.40, 3,178.17 and 1,144.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,120.40 : 3,178.17 = 1,144.46 : x
2. Step 2: Convert to fraction form
   2,120.40/3,178.17 = 1,144.46/x
3. Step 3: Cross multiply
   2,120.40x = 3,178.17 × 1,144.46
4. Step 4: Simplify right side
   2,120.40x = 3,637,272.55
5. Step 5: Solve for x
   x = 3,637,272.55/2,120.40
6. Step 6: Final answer
   x = 1,715.37