Finding the Fourth Proportional to 1,371.72, 1,892.67 and 812.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.72 : 1,892.67 = 812.22 : x
2. Step 2: Convert to fraction form
   1,371.72/1,892.67 = 812.22/x
3. Step 3: Cross multiply
   1,371.72x = 1,892.67 × 812.22
4. Step 4: Simplify right side
   1,371.72x = 1,537,264.43
5. Step 5: Solve for x
   x = 1,537,264.43/1,371.72
6. Step 6: Final answer
   x = 1,120.68