Finding the Fourth Proportional to 1,351.89, 2,025.60 and 830.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,351.89 : 2,025.60 = 830.79 : x
2. Step 2: Convert to fraction form
   1,351.89/2,025.60 = 830.79/x
3. Step 3: Cross multiply
   1,351.89x = 2,025.60 × 830.79
4. Step 4: Simplify right side
   1,351.89x = 1,682,848.22
5. Step 5: Solve for x
   x = 1,682,848.22/1,351.89
6. Step 6: Final answer
   x = 1,244.81