Finding the Fourth Proportional to 1,167.34, 1,610.94 and 643.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,167.34 : 1,610.94 = 643.39 : x
2. Step 2: Convert to fraction form
   1,167.34/1,610.94 = 643.39/x
3. Step 3: Cross multiply
   1,167.34x = 1,610.94 × 643.39
4. Step 4: Simplify right side
   1,167.34x = 1,036,462.69
5. Step 5: Solve for x
   x = 1,036,462.69/1,167.34
6. Step 6: Final answer
   x = 887.88