Finding the Fourth Proportional to 1,253.34, 1,729.89 and 811.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,253.34 : 1,729.89 = 811.35 : x
2. Step 2: Convert to fraction form
   1,253.34/1,729.89 = 811.35/x
3. Step 3: Cross multiply
   1,253.34x = 1,729.89 × 811.35
4. Step 4: Simplify right side
   1,253.34x = 1,403,546.25
5. Step 5: Solve for x
   x = 1,403,546.25/1,253.34
6. Step 6: Final answer
   x = 1,119.84