Finding the Fourth Proportional to 1,327.34, 1,988.78 and 864.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,327.34 : 1,988.78 = 864.42 : x
2. Step 2: Convert to fraction form
   1,327.34/1,988.78 = 864.42/x
3. Step 3: Cross multiply
   1,327.34x = 1,988.78 × 864.42
4. Step 4: Simplify right side
   1,327.34x = 1,719,136.89
5. Step 5: Solve for x
   x = 1,719,136.89/1,327.34
6. Step 6: Final answer
   x = 1,295.18