Finding the Fourth Proportional to 1,553.31, 2,143.71 and 854.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,553.31 : 2,143.71 = 854.73 : x
2. Step 2: Convert to fraction form
   1,553.31/2,143.71 = 854.73/x
3. Step 3: Cross multiply
   1,553.31x = 2,143.71 × 854.73
4. Step 4: Simplify right side
   1,553.31x = 1,832,293.25
5. Step 5: Solve for x
   x = 1,832,293.25/1,553.31
6. Step 6: Final answer
   x = 1,179.61