Finding the Fourth Proportional to 1,401.67, 1,933.53 and 811.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.67 : 1,933.53 = 811.99 : x
2. Step 2: Convert to fraction form
   1,401.67/1,933.53 = 811.99/x
3. Step 3: Cross multiply
   1,401.67x = 1,933.53 × 811.99
4. Step 4: Simplify right side
   1,401.67x = 1,570,007.02
5. Step 5: Solve for x
   x = 1,570,007.02/1,401.67
6. Step 6: Final answer
   x = 1,120.10