Finding the Fourth Proportional to 1,435.86, 1,981.38 and 939.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.86 : 1,981.38 = 939.48 : x
2. Step 2: Convert to fraction form
   1,435.86/1,981.38 = 939.48/x
3. Step 3: Cross multiply
   1,435.86x = 1,981.38 × 939.48
4. Step 4: Simplify right side
   1,435.86x = 1,861,466.88
5. Step 5: Solve for x
   x = 1,861,466.88/1,435.86
6. Step 6: Final answer
   x = 1,296.41