Finding the Fourth Proportional to 1,610.40, 2,418.03 and 1,392.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,610.40 : 2,418.03 = 1,392.78 : x
2. Step 2: Convert to fraction form
   1,610.40/2,418.03 = 1,392.78/x
3. Step 3: Cross multiply
   1,610.40x = 2,418.03 × 1,392.78
4. Step 4: Simplify right side
   1,610.40x = 3,367,783.82
5. Step 5: Solve for x
   x = 3,367,783.82/1,610.40
6. Step 6: Final answer
   x = 2,091.27