Finding the Fourth Proportional to 1,401.66, 1,934.96 and 811.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.66 : 1,934.96 = 811.98 : x
2. Step 2: Convert to fraction form
   1,401.66/1,934.96 = 811.98/x
3. Step 3: Cross multiply
   1,401.66x = 1,934.96 × 811.98
4. Step 4: Simplify right side
   1,401.66x = 1,571,144.76
5. Step 5: Solve for x
   x = 1,571,144.76/1,401.66
6. Step 6: Final answer
   x = 1,120.92