Finding the Fourth Proportional to 1,629.78, 2,439.80 and 1,142.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,629.78 : 2,439.80 = 1,142.56 : x
2. Step 2: Convert to fraction form
   1,629.78/2,439.80 = 1,142.56/x
3. Step 3: Cross multiply
   1,629.78x = 2,439.80 × 1,142.56
4. Step 4: Simplify right side
   1,629.78x = 2,787,617.89
5. Step 5: Solve for x
   x = 2,787,617.89/1,629.78
6. Step 6: Final answer
   x = 1,710.43