Finding the Fourth Proportional to 1,570.33, 2,350.89 and 828.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.33 : 2,350.89 = 828.19 : x
2. Step 2: Convert to fraction form
   1,570.33/2,350.89 = 828.19/x
3. Step 3: Cross multiply
   1,570.33x = 2,350.89 × 828.19
4. Step 4: Simplify right side
   1,570.33x = 1,946,967.69
5. Step 5: Solve for x
   x = 1,946,967.69/1,570.33
6. Step 6: Final answer
   x = 1,239.85