Finding the Fourth Proportional to 1,389.42, 1,917.54 and 800.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.42 : 1,917.54 = 800.08 : x
2. Step 2: Convert to fraction form
   1,389.42/1,917.54 = 800.08/x
3. Step 3: Cross multiply
   1,389.42x = 1,917.54 × 800.08
4. Step 4: Simplify right side
   1,389.42x = 1,534,180.61
5. Step 5: Solve for x
   x = 1,534,180.61/1,389.42
6. Step 6: Final answer
   x = 1,104.19