Finding the Fourth Proportional to 1,405.54, 1,939.82 and 816.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.54 : 1,939.82 = 816.11 : x
2. Step 2: Convert to fraction form
   1,405.54/1,939.82 = 816.11/x
3. Step 3: Cross multiply
   1,405.54x = 1,939.82 × 816.11
4. Step 4: Simplify right side
   1,405.54x = 1,583,106.50
5. Step 5: Solve for x
   x = 1,583,106.50/1,405.54
6. Step 6: Final answer
   x = 1,126.33