Finding the Fourth Proportional to 1,401.05, 1,933.39 and 811.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.05 : 1,933.39 = 811.78 : x
2. Step 2: Convert to fraction form
   1,401.05/1,933.39 = 811.78/x
3. Step 3: Cross multiply
   1,401.05x = 1,933.39 × 811.78
4. Step 4: Simplify right side
   1,401.05x = 1,569,478.95
5. Step 5: Solve for x
   x = 1,569,478.95/1,401.05
6. Step 6: Final answer
   x = 1,120.21