Finding the Fourth Proportional to 1,761.54, 2,429.78 and 1,172.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,761.54 : 2,429.78 = 1,172.12 : x
2. Step 2: Convert to fraction form
   1,761.54/2,429.78 = 1,172.12/x
3. Step 3: Cross multiply
   1,761.54x = 2,429.78 × 1,172.12
4. Step 4: Simplify right side
   1,761.54x = 2,847,993.73
5. Step 5: Solve for x
   x = 2,847,993.73/1,761.54
6. Step 6: Final answer
   x = 1,616.76