Finding the Fourth Proportional to 1,389.43, 1,917.57 and 800.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.43 : 1,917.57 = 800.02 : x
2. Step 2: Convert to fraction form
   1,389.43/1,917.57 = 800.02/x
3. Step 3: Cross multiply
   1,389.43x = 1,917.57 × 800.02
4. Step 4: Simplify right side
   1,389.43x = 1,534,094.35
5. Step 5: Solve for x
   x = 1,534,094.35/1,389.43
6. Step 6: Final answer
   x = 1,104.12