Finding the Fourth Proportional to 1,428.77, 1,971.67 and 799.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.77 : 1,971.67 = 799.30 : x
2. Step 2: Convert to fraction form
   1,428.77/1,971.67 = 799.30/x
3. Step 3: Cross multiply
   1,428.77x = 1,971.67 × 799.30
4. Step 4: Simplify right side
   1,428.77x = 1,575,958.76
5. Step 5: Solve for x
   x = 1,575,958.76/1,428.77
6. Step 6: Final answer
   x = 1,103.02