Finding the Fourth Proportional to 1,860.91, 2,568.15 and 1,021.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,860.91 : 2,568.15 = 1,021.61 : x
2. Step 2: Convert to fraction form
   1,860.91/2,568.15 = 1,021.61/x
3. Step 3: Cross multiply
   1,860.91x = 2,568.15 × 1,021.61
4. Step 4: Simplify right side
   1,860.91x = 2,623,632.33
5. Step 5: Solve for x
   x = 2,623,632.33/1,860.91
6. Step 6: Final answer
   x = 1,409.87