Finding the Fourth Proportional to 1,167.14, 1,610.69 and 643.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,167.14 : 1,610.69 = 643.17 : x
2. Step 2: Convert to fraction form
   1,167.14/1,610.69 = 643.17/x
3. Step 3: Cross multiply
   1,167.14x = 1,610.69 × 643.17
4. Step 4: Simplify right side
   1,167.14x = 1,035,944.27
5. Step 5: Solve for x
   x = 1,035,944.27/1,167.14
6. Step 6: Final answer
   x = 887.60