Finding the Fourth Proportional to 1,356.63, 1,871.61 and 885.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,356.63 : 1,871.61 = 885.08 : x
2. Step 2: Convert to fraction form
   1,356.63/1,871.61 = 885.08/x
3. Step 3: Cross multiply
   1,356.63x = 1,871.61 × 885.08
4. Step 4: Simplify right side
   1,356.63x = 1,656,524.58
5. Step 5: Solve for x
   x = 1,656,524.58/1,356.63
6. Step 6: Final answer
   x = 1,221.06