Finding the Fourth Proportional to 1,570.82, 2,354.15 and 839.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.82 : 2,354.15 = 839.30 : x
2. Step 2: Convert to fraction form
   1,570.82/2,354.15 = 839.30/x
3. Step 3: Cross multiply
   1,570.82x = 2,354.15 × 839.30
4. Step 4: Simplify right side
   1,570.82x = 1,975,838.10
5. Step 5: Solve for x
   x = 1,975,838.10/1,570.82
6. Step 6: Final answer
   x = 1,257.84