Finding the Fourth Proportional to 1,357.28, 2,034.90 and 869.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,357.28 : 2,034.90 = 869.39 : x
2. Step 2: Convert to fraction form
   1,357.28/2,034.90 = 869.39/x
3. Step 3: Cross multiply
   1,357.28x = 2,034.90 × 869.39
4. Step 4: Simplify right side
   1,357.28x = 1,769,111.54
5. Step 5: Solve for x
   x = 1,769,111.54/1,357.28
6. Step 6: Final answer
   x = 1,303.43