Finding the Fourth Proportional to 1,167.90, 1,610.55 and 905.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,167.90 : 1,610.55 = 905.82 : x
2. Step 2: Convert to fraction form
   1,167.90/1,610.55 = 905.82/x
3. Step 3: Cross multiply
   1,167.90x = 1,610.55 × 905.82
4. Step 4: Simplify right side
   1,167.90x = 1,458,868.40
5. Step 5: Solve for x
   x = 1,458,868.40/1,167.90
6. Step 6: Final answer
   x = 1,249.14