Finding the Fourth Proportional to 1,406.71, 1,941.56 and 817.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,406.71 : 1,941.56 = 817.21 : x
2. Step 2: Convert to fraction form
   1,406.71/1,941.56 = 817.21/x
3. Step 3: Cross multiply
   1,406.71x = 1,941.56 × 817.21
4. Step 4: Simplify right side
   1,406.71x = 1,586,662.25
5. Step 5: Solve for x
   x = 1,586,662.25/1,406.71
6. Step 6: Final answer
   x = 1,127.92