Finding the Fourth Proportional to 1,167.43, 1,611.06 and 643.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,167.43 : 1,611.06 = 643.48 : x
2. Step 2: Convert to fraction form
   1,167.43/1,611.06 = 643.48/x
3. Step 3: Cross multiply
   1,167.43x = 1,611.06 × 643.48
4. Step 4: Simplify right side
   1,167.43x = 1,036,684.89
5. Step 5: Solve for x
   x = 1,036,684.89/1,167.43
6. Step 6: Final answer
   x = 888.01