Finding the Fourth Proportional to 1,405.46, 1,939.56 and 816.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.46 : 1,939.56 = 816.03 : x
2. Step 2: Convert to fraction form
   1,405.46/1,939.56 = 816.03/x
3. Step 3: Cross multiply
   1,405.46x = 1,939.56 × 816.03
4. Step 4: Simplify right side
   1,405.46x = 1,582,736.09
5. Step 5: Solve for x
   x = 1,582,736.09/1,405.46
6. Step 6: Final answer
   x = 1,126.14