Finding the Fourth Proportional to 1,401.23, 1,933.54 and 811.65

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.23 : 1,933.54 = 811.65 : x
2. Step 2: Convert to fraction form
   1,401.23/1,933.54 = 811.65/x
3. Step 3: Cross multiply
   1,401.23x = 1,933.54 × 811.65
4. Step 4: Simplify right side
   1,401.23x = 1,569,357.74
5. Step 5: Solve for x
   x = 1,569,357.74/1,401.23
6. Step 6: Final answer
   x = 1,119.99