Finding the Fourth Proportional to 1,435.59, 1,980.41 and 905.13

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.59 : 1,980.41 = 905.13 : x
2. Step 2: Convert to fraction form
   1,435.59/1,980.41 = 905.13/x
3. Step 3: Cross multiply
   1,435.59x = 1,980.41 × 905.13
4. Step 4: Simplify right side
   1,435.59x = 1,792,523.98
5. Step 5: Solve for x
   x = 1,792,523.98/1,435.59
6. Step 6: Final answer
   x = 1,248.63