Finding the Fourth Proportional to 1,570.31, 2,355.43 and 841.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.31 : 2,355.43 = 841.31 : x
2. Step 2: Convert to fraction form
   1,570.31/2,355.43 = 841.31/x
3. Step 3: Cross multiply
   1,570.31x = 2,355.43 × 841.31
4. Step 4: Simplify right side
   1,570.31x = 1,981,646.81
5. Step 5: Solve for x
   x = 1,981,646.81/1,570.31
6. Step 6: Final answer
   x = 1,261.95