Finding the Fourth Proportional to 1,435.37, 1,980.80 and 845.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.37 : 1,980.80 = 845.90 : x
2. Step 2: Convert to fraction form
   1,435.37/1,980.80 = 845.90/x
3. Step 3: Cross multiply
   1,435.37x = 1,980.80 × 845.90
4. Step 4: Simplify right side
   1,435.37x = 1,675,544.59
5. Step 5: Solve for x
   x = 1,675,544.59/1,435.37
6. Step 6: Final answer
   x = 1,167.33