Finding the Fourth Proportional to 1,389.74, 1,917.54 and 800.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.74 : 1,917.54 = 800.06 : x
2. Step 2: Convert to fraction form
   1,389.74/1,917.54 = 800.06/x
3. Step 3: Cross multiply
   1,389.74x = 1,917.54 × 800.06
4. Step 4: Simplify right side
   1,389.74x = 1,534,137.46
5. Step 5: Solve for x
   x = 1,534,137.46/1,389.74
6. Step 6: Final answer
   x = 1,103.91