Finding the Fourth Proportional to 1,405.67, 1,939.83 and 816.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.67 : 1,939.83 = 816.32 : x
2. Step 2: Convert to fraction form
   1,405.67/1,939.83 = 816.32/x
3. Step 3: Cross multiply
   1,405.67x = 1,939.83 × 816.32
4. Step 4: Simplify right side
   1,405.67x = 1,583,522.03
5. Step 5: Solve for x
   x = 1,583,522.03/1,405.67
6. Step 6: Final answer
   x = 1,126.52