Finding the Fourth Proportional to 1,435.88, 1,981.52 and 939.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.88 : 1,981.52 = 939.35 : x
2. Step 2: Convert to fraction form
   1,435.88/1,981.52 = 939.35/x
3. Step 3: Cross multiply
   1,435.88x = 1,981.52 × 939.35
4. Step 4: Simplify right side
   1,435.88x = 1,861,326.21
5. Step 5: Solve for x
   x = 1,861,326.21/1,435.88
6. Step 6: Final answer
   x = 1,296.30