Finding the Fourth Proportional to 1,405.68, 1,939.98 and 816.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.68 : 1,939.98 = 816.54 : x
2. Step 2: Convert to fraction form
   1,405.68/1,939.98 = 816.54/x
3. Step 3: Cross multiply
   1,405.68x = 1,939.98 × 816.54
4. Step 4: Simplify right side
   1,405.68x = 1,584,071.27
5. Step 5: Solve for x
   x = 1,584,071.27/1,405.68
6. Step 6: Final answer
   x = 1,126.91