Finding the Fourth Proportional to 1,372.27, 1,893.97 and 813.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,372.27 : 1,893.97 = 813.05 : x
2. Step 2: Convert to fraction form
   1,372.27/1,893.97 = 813.05/x
3. Step 3: Cross multiply
   1,372.27x = 1,893.97 × 813.05
4. Step 4: Simplify right side
   1,372.27x = 1,539,885.88
5. Step 5: Solve for x
   x = 1,539,885.88/1,372.27
6. Step 6: Final answer
   x = 1,122.15