Finding the Fourth Proportional to 1,437.78, 1,984.17 and 808.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,437.78 : 1,984.17 = 808.35 : x
2. Step 2: Convert to fraction form
   1,437.78/1,984.17 = 808.35/x
3. Step 3: Cross multiply
   1,437.78x = 1,984.17 × 808.35
4. Step 4: Simplify right side
   1,437.78x = 1,603,903.82
5. Step 5: Solve for x
   x = 1,603,903.82/1,437.78
6. Step 6: Final answer
   x = 1,115.54