Finding the Fourth Proportional to 1,570.31, 2,354.24 and 911.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.31 : 2,354.24 = 911.17 : x
2. Step 2: Convert to fraction form
   1,570.31/2,354.24 = 911.17/x
3. Step 3: Cross multiply
   1,570.31x = 2,354.24 × 911.17
4. Step 4: Simplify right side
   1,570.31x = 2,145,113.33
5. Step 5: Solve for x
   x = 2,145,113.33/1,570.31
6. Step 6: Final answer
   x = 1,366.05