Finding the Fourth Proportional to 1,405.24, 1,938.83 and 845.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.24 : 1,938.83 = 845.43 : x
2. Step 2: Convert to fraction form
   1,405.24/1,938.83 = 845.43/x
3. Step 3: Cross multiply
   1,405.24x = 1,938.83 × 845.43
4. Step 4: Simplify right side
   1,405.24x = 1,639,145.05
5. Step 5: Solve for x
   x = 1,639,145.05/1,405.24
6. Step 6: Final answer
   x = 1,166.45