Finding the Fourth Proportional to 1,339.88, 1,848.16 and 808.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.88 : 1,848.16 = 808.40 : x
2. Step 2: Convert to fraction form
   1,339.88/1,848.16 = 808.40/x
3. Step 3: Cross multiply
   1,339.88x = 1,848.16 × 808.40
4. Step 4: Simplify right side
   1,339.88x = 1,494,055.14
5. Step 5: Solve for x
   x = 1,494,055.14/1,339.88
6. Step 6: Final answer
   x = 1,115.06