Finding the Fourth Proportional to 1,043.48, 1,436.72 and 885.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,043.48 : 1,436.72 = 885.78 : x
2. Step 2: Convert to fraction form
   1,043.48/1,436.72 = 885.78/x
3. Step 3: Cross multiply
   1,043.48x = 1,436.72 × 885.78
4. Step 4: Simplify right side
   1,043.48x = 1,272,613.41
5. Step 5: Solve for x
   x = 1,272,613.41/1,043.48
6. Step 6: Final answer
   x = 1,219.59