Finding the Fourth Proportional to 1,435.22, 1,980.25 and 845.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.22 : 1,980.25 = 845.78 : x
2. Step 2: Convert to fraction form
   1,435.22/1,980.25 = 845.78/x
3. Step 3: Cross multiply
   1,435.22x = 1,980.25 × 845.78
4. Step 4: Simplify right side
   1,435.22x = 1,674,843.83
5. Step 5: Solve for x
   x = 1,674,843.83/1,435.22
6. Step 6: Final answer
   x = 1,166.96