Finding the Fourth Proportional to 1,405.41, 1,940.12 and 815.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.41 : 1,940.12 = 815.83 : x
2. Step 2: Convert to fraction form
   1,405.41/1,940.12 = 815.83/x
3. Step 3: Cross multiply
   1,405.41x = 1,940.12 × 815.83
4. Step 4: Simplify right side
   1,405.41x = 1,582,808.10
5. Step 5: Solve for x
   x = 1,582,808.10/1,405.41
6. Step 6: Final answer
   x = 1,126.23