Finding the Fourth Proportional to 1,968.11, 2,715.89 and 1,128.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,968.11 : 2,715.89 = 1,128.77 : x
2. Step 2: Convert to fraction form
   1,968.11/2,715.89 = 1,128.77/x
3. Step 3: Cross multiply
   1,968.11x = 2,715.89 × 1,128.77
4. Step 4: Simplify right side
   1,968.11x = 3,065,595.93
5. Step 5: Solve for x
   x = 3,065,595.93/1,968.11
6. Step 6: Final answer
   x = 1,557.64