Finding the Fourth Proportional to 1,372.38, 1,893.72 and 812.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,372.38 : 1,893.72 = 812.82 : x
2. Step 2: Convert to fraction form
   1,372.38/1,893.72 = 812.82/x
3. Step 3: Cross multiply
   1,372.38x = 1,893.72 × 812.82
4. Step 4: Simplify right side
   1,372.38x = 1,539,253.49
5. Step 5: Solve for x
   x = 1,539,253.49/1,372.38
6. Step 6: Final answer
   x = 1,121.59