Finding the Fourth Proportional to 1,409.90, 1,945.43 and 885.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,409.90 : 1,945.43 = 885.56 : x
2. Step 2: Convert to fraction form
   1,409.90/1,945.43 = 885.56/x
3. Step 3: Cross multiply
   1,409.90x = 1,945.43 × 885.56
4. Step 4: Simplify right side
   1,409.90x = 1,722,780.84
5. Step 5: Solve for x
   x = 1,722,780.84/1,409.90
6. Step 6: Final answer
   x = 1,221.92