Finding the Fourth Proportional to 1,019.88, 1,405.89 and 798.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.88 : 1,405.89 = 798.45 : x
2. Step 2: Convert to fraction form
   1,019.88/1,405.89 = 798.45/x
3. Step 3: Cross multiply
   1,019.88x = 1,405.89 × 798.45
4. Step 4: Simplify right side
   1,019.88x = 1,122,532.87
5. Step 5: Solve for x
   x = 1,122,532.87/1,019.88
6. Step 6: Final answer
   x = 1,100.65