Finding the Fourth Proportional to 1,428.65, 1,971.47 and 799.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.65 : 1,971.47 = 799.25 : x
2. Step 2: Convert to fraction form
   1,428.65/1,971.47 = 799.25/x
3. Step 3: Cross multiply
   1,428.65x = 1,971.47 × 799.25
4. Step 4: Simplify right side
   1,428.65x = 1,575,683.54
5. Step 5: Solve for x
   x = 1,575,683.54/1,428.65
6. Step 6: Final answer
   x = 1,102.92