Finding the Fourth Proportional to 1,389.46, 1,917.04 and 799.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.46 : 1,917.04 = 799.98 : x
2. Step 2: Convert to fraction form
   1,389.46/1,917.04 = 799.98/x
3. Step 3: Cross multiply
   1,389.46x = 1,917.04 × 799.98
4. Step 4: Simplify right side
   1,389.46x = 1,533,595.66
5. Step 5: Solve for x
   x = 1,533,595.66/1,389.46
6. Step 6: Final answer
   x = 1,103.74