Finding the Fourth Proportional to 1,401.23, 1,934.34 and 811.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.23 : 1,934.34 = 811.64 : x
2. Step 2: Convert to fraction form
   1,401.23/1,934.34 = 811.64/x
3. Step 3: Cross multiply
   1,401.23x = 1,934.34 × 811.64
4. Step 4: Simplify right side
   1,401.23x = 1,569,978.05
5. Step 5: Solve for x
   x = 1,569,978.05/1,401.23
6. Step 6: Final answer
   x = 1,120.43