Finding the Fourth Proportional to 1,405.02, 1,938.09 and 845.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.02 : 1,938.09 = 845.31 : x
2. Step 2: Convert to fraction form
   1,405.02/1,938.09 = 845.31/x
3. Step 3: Cross multiply
   1,405.02x = 1,938.09 × 845.31
4. Step 4: Simplify right side
   1,405.02x = 1,638,286.86
5. Step 5: Solve for x
   x = 1,638,286.86/1,405.02
6. Step 6: Final answer
   x = 1,166.02