Finding the Fourth Proportional to 3,128.52, 4,689.90 and 1,179.40

Step by Step Solution

1. Step 1: Write the proportion equation
   3,128.52 : 4,689.90 = 1,179.40 : x
2. Step 2: Convert to fraction form
   3,128.52/4,689.90 = 1,179.40/x
3. Step 3: Cross multiply
   3,128.52x = 4,689.90 × 1,179.40
4. Step 4: Simplify right side
   3,128.52x = 5,531,268.06
5. Step 5: Solve for x
   x = 5,531,268.06/3,128.52
6. Step 6: Final answer
   x = 1,768.01