Finding the Fourth Proportional to 1,445.80, 1,995.39 and 816.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.80 : 1,995.39 = 816.37 : x
2. Step 2: Convert to fraction form
   1,445.80/1,995.39 = 816.37/x
3. Step 3: Cross multiply
   1,445.80x = 1,995.39 × 816.37
4. Step 4: Simplify right side
   1,445.80x = 1,628,966.56
5. Step 5: Solve for x
   x = 1,628,966.56/1,445.80
6. Step 6: Final answer
   x = 1,126.69