Finding the Fourth Proportional to 1,446.30, 1,995.90 and 783.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,446.30 : 1,995.90 = 783.15 : x
2. Step 2: Convert to fraction form
   1,446.30/1,995.90 = 783.15/x
3. Step 3: Cross multiply
   1,446.30x = 1,995.90 × 783.15
4. Step 4: Simplify right side
   1,446.30x = 1,563,089.09
5. Step 5: Solve for x
   x = 1,563,089.09/1,446.30
6. Step 6: Final answer
   x = 1,080.75