Finding the Fourth Proportional to 1,405.47, 1,939.77 and 845.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.47 : 1,939.77 = 845.96 : x
2. Step 2: Convert to fraction form
   1,405.47/1,939.77 = 845.96/x
3. Step 3: Cross multiply
   1,405.47x = 1,939.77 × 845.96
4. Step 4: Simplify right side
   1,405.47x = 1,640,963.60
5. Step 5: Solve for x
   x = 1,640,963.60/1,405.47
6. Step 6: Final answer
   x = 1,167.56