Finding the Fourth Proportional to 1,434.72, 1,979.94 and 813.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.72 : 1,979.94 = 813.72 : x
2. Step 2: Convert to fraction form
   1,434.72/1,979.94 = 813.72/x
3. Step 3: Cross multiply
   1,434.72x = 1,979.94 × 813.72
4. Step 4: Simplify right side
   1,434.72x = 1,611,116.78
5. Step 5: Solve for x
   x = 1,611,116.78/1,434.72
6. Step 6: Final answer
   x = 1,122.95