Finding the Fourth Proportional to 1,339.80, 1,849.55 and 1,008.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.80 : 1,849.55 = 1,008.35 : x
2. Step 2: Convert to fraction form
   1,339.80/1,849.55 = 1,008.35/x
3. Step 3: Cross multiply
   1,339.80x = 1,849.55 × 1,008.35
4. Step 4: Simplify right side
   1,339.80x = 1,864,979.45
5. Step 5: Solve for x
   x = 1,864,979.45/1,339.80
6. Step 6: Final answer
   x = 1,391.98