Finding the Fourth Proportional to 1,371.88, 1,892.73 and 812.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.88 : 1,892.73 = 812.53 : x
2. Step 2: Convert to fraction form
   1,371.88/1,892.73 = 812.53/x
3. Step 3: Cross multiply
   1,371.88x = 1,892.73 × 812.53
4. Step 4: Simplify right side
   1,371.88x = 1,537,899.91
5. Step 5: Solve for x
   x = 1,537,899.91/1,371.88
6. Step 6: Final answer
   x = 1,121.02