Finding the Fourth Proportional to 1,372.15, 1,893.59 and 812.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,372.15 : 1,893.59 = 812.41 : x
2. Step 2: Convert to fraction form
   1,372.15/1,893.59 = 812.41/x
3. Step 3: Cross multiply
   1,372.15x = 1,893.59 × 812.41
4. Step 4: Simplify right side
   1,372.15x = 1,538,371.45
5. Step 5: Solve for x
   x = 1,538,371.45/1,372.15
6. Step 6: Final answer
   x = 1,121.14