Finding the Fourth Proportional to 1,342.72, 1,852.56 and 811.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,342.72 : 1,852.56 = 811.72 : x
2. Step 2: Convert to fraction form
   1,342.72/1,852.56 = 811.72/x
3. Step 3: Cross multiply
   1,342.72x = 1,852.56 × 811.72
4. Step 4: Simplify right side
   1,342.72x = 1,503,760.00
5. Step 5: Solve for x
   x = 1,503,760.00/1,342.72
6. Step 6: Final answer
   x = 1,119.94