Finding the Fourth Proportional to 1,361.72, 1,878.82 and 864.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,361.72 : 1,878.82 = 864.17 : x
2. Step 2: Convert to fraction form
   1,361.72/1,878.82 = 864.17/x
3. Step 3: Cross multiply
   1,361.72x = 1,878.82 × 864.17
4. Step 4: Simplify right side
   1,361.72x = 1,623,619.88
5. Step 5: Solve for x
   x = 1,623,619.88/1,361.72
6. Step 6: Final answer
   x = 1,192.33