Finding the Fourth Proportional to 1,339.53, 1,848.09 and 808.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.53 : 1,848.09 = 808.21 : x
2. Step 2: Convert to fraction form
   1,339.53/1,848.09 = 808.21/x
3. Step 3: Cross multiply
   1,339.53x = 1,848.09 × 808.21
4. Step 4: Simplify right side
   1,339.53x = 1,493,644.82
5. Step 5: Solve for x
   x = 1,493,644.82/1,339.53
6. Step 6: Final answer
   x = 1,115.05