Finding the Fourth Proportional to 1,401.71, 1,933.72 and 811.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.71 : 1,933.72 = 811.92 : x
2. Step 2: Convert to fraction form
   1,401.71/1,933.72 = 811.92/x
3. Step 3: Cross multiply
   1,401.71x = 1,933.72 × 811.92
4. Step 4: Simplify right side
   1,401.71x = 1,570,035.73
5. Step 5: Solve for x
   x = 1,570,035.73/1,401.71
6. Step 6: Final answer
   x = 1,120.09