Finding the Fourth Proportional to 1,428.73, 1,971.55 and 799.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.73 : 1,971.55 = 799.15 : x
2. Step 2: Convert to fraction form
   1,428.73/1,971.55 = 799.15/x
3. Step 3: Cross multiply
   1,428.73x = 1,971.55 × 799.15
4. Step 4: Simplify right side
   1,428.73x = 1,575,554.32
5. Step 5: Solve for x
   x = 1,575,554.32/1,428.73
6. Step 6: Final answer
   x = 1,102.77