Finding the Fourth Proportional to 1,406.55, 1,940.72 and 816.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,406.55 : 1,940.72 = 816.74 : x
2. Step 2: Convert to fraction form
   1,406.55/1,940.72 = 816.74/x
3. Step 3: Cross multiply
   1,406.55x = 1,940.72 × 816.74
4. Step 4: Simplify right side
   1,406.55x = 1,585,049.87
5. Step 5: Solve for x
   x = 1,585,049.87/1,406.55
6. Step 6: Final answer
   x = 1,126.91