Finding the Fourth Proportional to 1,436.31, 1,981.56 and 911.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.31 : 1,981.56 = 911.43 : x
2. Step 2: Convert to fraction form
   1,436.31/1,981.56 = 911.43/x
3. Step 3: Cross multiply
   1,436.31x = 1,981.56 × 911.43
4. Step 4: Simplify right side
   1,436.31x = 1,806,053.23
5. Step 5: Solve for x
   x = 1,806,053.23/1,436.31
6. Step 6: Final answer
   x = 1,257.43