Finding the Fourth Proportional to 1,401.06, 1,933.56 and 811.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.06 : 1,933.56 = 811.80 : x
2. Step 2: Convert to fraction form
   1,401.06/1,933.56 = 811.80/x
3. Step 3: Cross multiply
   1,401.06x = 1,933.56 × 811.80
4. Step 4: Simplify right side
   1,401.06x = 1,569,664.01
5. Step 5: Solve for x
   x = 1,569,664.01/1,401.06
6. Step 6: Final answer
   x = 1,120.34