Finding the Fourth Proportional to 1,372.43, 1,893.67 and 812.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,372.43 : 1,893.67 = 812.70 : x
2. Step 2: Convert to fraction form
   1,372.43/1,893.67 = 812.70/x
3. Step 3: Cross multiply
   1,372.43x = 1,893.67 × 812.70
4. Step 4: Simplify right side
   1,372.43x = 1,538,983.58
5. Step 5: Solve for x
   x = 1,538,983.58/1,372.43
6. Step 6: Final answer
   x = 1,121.35