Finding the Fourth Proportional to 1,968.29, 2,715.46 and 1,128.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,968.29 : 2,715.46 = 1,128.81 : x
2. Step 2: Convert to fraction form
   1,968.29/2,715.46 = 1,128.81/x
3. Step 3: Cross multiply
   1,968.29x = 2,715.46 × 1,128.81
4. Step 4: Simplify right side
   1,968.29x = 3,065,235.58
5. Step 5: Solve for x
   x = 3,065,235.58/1,968.29
6. Step 6: Final answer
   x = 1,557.31