Finding the Fourth Proportional to 1,401.48, 1,933.89 and 811.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.48 : 1,933.89 = 811.89 : x
2. Step 2: Convert to fraction form
   1,401.48/1,933.89 = 811.89/x
3. Step 3: Cross multiply
   1,401.48x = 1,933.89 × 811.89
4. Step 4: Simplify right side
   1,401.48x = 1,570,105.95
5. Step 5: Solve for x
   x = 1,570,105.95/1,401.48
6. Step 6: Final answer
   x = 1,120.32