Finding the Fourth Proportional to 2,145.47, 2,960.89 and 1,201.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.47 : 2,960.89 = 1,201.21 : x
2. Step 2: Convert to fraction form
   2,145.47/2,960.89 = 1,201.21/x
3. Step 3: Cross multiply
   2,145.47x = 2,960.89 × 1,201.21
4. Step 4: Simplify right side
   2,145.47x = 3,556,640.27
5. Step 5: Solve for x
   x = 3,556,640.27/2,145.47
6. Step 6: Final answer
   x = 1,657.74