Finding the Fourth Proportional to 1,548.51, 2,136.78 and 885.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,548.51 : 2,136.78 = 885.30 : x
2. Step 2: Convert to fraction form
   1,548.51/2,136.78 = 885.30/x
3. Step 3: Cross multiply
   1,548.51x = 2,136.78 × 885.30
4. Step 4: Simplify right side
   1,548.51x = 1,891,691.33
5. Step 5: Solve for x
   x = 1,891,691.33/1,548.51
6. Step 6: Final answer
   x = 1,221.62