Finding the Fourth Proportional to 1,610.33, 2,411.15 and 839.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,610.33 : 2,411.15 = 839.21 : x
2. Step 2: Convert to fraction form
   1,610.33/2,411.15 = 839.21/x
3. Step 3: Cross multiply
   1,610.33x = 2,411.15 × 839.21
4. Step 4: Simplify right side
   1,610.33x = 2,023,444.94
5. Step 5: Solve for x
   x = 2,023,444.94/1,610.33
6. Step 6: Final answer
   x = 1,256.54