Finding the Fourth Proportional to 1,435.34, 1,981.25 and 905.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.34 : 1,981.25 = 905.10 : x
2. Step 2: Convert to fraction form
   1,435.34/1,981.25 = 905.10/x
3. Step 3: Cross multiply
   1,435.34x = 1,981.25 × 905.10
4. Step 4: Simplify right side
   1,435.34x = 1,793,224.85
5. Step 5: Solve for x
   x = 1,793,224.85/1,435.34
6. Step 6: Final answer
   x = 1,249.34