Finding the Fourth Proportional to 1,435.86, 1,981.38 and 806.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.86 : 1,981.38 = 806.30 : x
2. Step 2: Convert to fraction form
   1,435.86/1,981.38 = 806.30/x
3. Step 3: Cross multiply
   1,435.86x = 1,981.38 × 806.30
4. Step 4: Simplify right side
   1,435.86x = 1,597,576.79
5. Step 5: Solve for x
   x = 1,597,576.79/1,435.86
6. Step 6: Final answer
   x = 1,112.63