Finding the Fourth Proportional to 1,428.70, 1,971.59 and 799.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.70 : 1,971.59 = 799.23 : x
2. Step 2: Convert to fraction form
   1,428.70/1,971.59 = 799.23/x
3. Step 3: Cross multiply
   1,428.70x = 1,971.59 × 799.23
4. Step 4: Simplify right side
   1,428.70x = 1,575,742.02
5. Step 5: Solve for x
   x = 1,575,742.02/1,428.70
6. Step 6: Final answer
   x = 1,102.92