Finding the Fourth Proportional to 1,405.45, 1,939.89 and 845.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.45 : 1,939.89 = 845.95 : x
2. Step 2: Convert to fraction form
   1,405.45/1,939.89 = 845.95/x
3. Step 3: Cross multiply
   1,405.45x = 1,939.89 × 845.95
4. Step 4: Simplify right side
   1,405.45x = 1,641,049.95
5. Step 5: Solve for x
   x = 1,641,049.95/1,405.45
6. Step 6: Final answer
   x = 1,167.63