Finding the Fourth Proportional to 2,185.71, 3,015.75 and 1,289.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.71 : 3,015.75 = 1,289.52 : x
2. Step 2: Convert to fraction form
   2,185.71/3,015.75 = 1,289.52/x
3. Step 3: Cross multiply
   2,185.71x = 3,015.75 × 1,289.52
4. Step 4: Simplify right side
   2,185.71x = 3,888,869.94
5. Step 5: Solve for x
   x = 3,888,869.94/2,185.71
6. Step 6: Final answer
   x = 1,779.23