Finding the Fourth Proportional to 3,886.69, 5,828.14 and 1,288.75

Step by Step Solution

1. Step 1: Write the proportion equation
   3,886.69 : 5,828.14 = 1,288.75 : x
2. Step 2: Convert to fraction form
   3,886.69/5,828.14 = 1,288.75/x
3. Step 3: Cross multiply
   3,886.69x = 5,828.14 × 1,288.75
4. Step 4: Simplify right side
   3,886.69x = 7,511,015.43
5. Step 5: Solve for x
   x = 7,511,015.43/3,886.69
6. Step 6: Final answer
   x = 1,932.50