Finding the Fourth Proportional to 2,145.39, 2,959.52 and 1,620.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.39 : 2,959.52 = 1,620.51 : x
2. Step 2: Convert to fraction form
   2,145.39/2,959.52 = 1,620.51/x
3. Step 3: Cross multiply
   2,145.39x = 2,959.52 × 1,620.51
4. Step 4: Simplify right side
   2,145.39x = 4,795,923.65
5. Step 5: Solve for x
   x = 4,795,923.65/2,145.39
6. Step 6: Final answer
   x = 2,235.46