Finding the Fourth Proportional to 1,367.91, 1,887.57 and 808.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,367.91 : 1,887.57 = 808.40 : x
2. Step 2: Convert to fraction form
   1,367.91/1,887.57 = 808.40/x
3. Step 3: Cross multiply
   1,367.91x = 1,887.57 × 808.40
4. Step 4: Simplify right side
   1,367.91x = 1,525,916.31
5. Step 5: Solve for x
   x = 1,525,916.31/1,367.91
6. Step 6: Final answer
   x = 1,115.51