Finding the Fourth Proportional to 1,389.58, 1,917.02 and 799.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.58 : 1,917.02 = 799.99 : x
2. Step 2: Convert to fraction form
   1,389.58/1,917.02 = 799.99/x
3. Step 3: Cross multiply
   1,389.58x = 1,917.02 × 799.99
4. Step 4: Simplify right side
   1,389.58x = 1,533,594.04
5. Step 5: Solve for x
   x = 1,533,594.04/1,389.58
6. Step 6: Final answer
   x = 1,103.64