Finding the Fourth Proportional to 1,434.56, 1,979.58 and 813.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.56 : 1,979.58 = 813.56 : x
2. Step 2: Convert to fraction form
   1,434.56/1,979.58 = 813.56/x
3. Step 3: Cross multiply
   1,434.56x = 1,979.58 × 813.56
4. Step 4: Simplify right side
   1,434.56x = 1,610,507.10
5. Step 5: Solve for x
   x = 1,610,507.10/1,434.56
6. Step 6: Final answer
   x = 1,122.65