Finding the Fourth Proportional to 1,389.60, 1,917.25 and 800.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.60 : 1,917.25 = 800.03 : x
2. Step 2: Convert to fraction form
   1,389.60/1,917.25 = 800.03/x
3. Step 3: Cross multiply
   1,389.60x = 1,917.25 × 800.03
4. Step 4: Simplify right side
   1,389.60x = 1,533,860.31
5. Step 5: Solve for x
   x = 1,533,860.31/1,389.60
6. Step 6: Final answer
   x = 1,103.81