Finding the Fourth Proportional to 1,428.84, 1,971.58 and 799.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.84 : 1,971.58 = 799.40 : x
2. Step 2: Convert to fraction form
   1,428.84/1,971.58 = 799.40/x
3. Step 3: Cross multiply
   1,428.84x = 1,971.58 × 799.40
4. Step 4: Simplify right side
   1,428.84x = 1,576,081.05
5. Step 5: Solve for x
   x = 1,576,081.05/1,428.84
6. Step 6: Final answer
   x = 1,103.05