Finding the Fourth Proportional to 1,557.71, 2,149.82 and 885.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,557.71 : 2,149.82 = 885.61 : x
2. Step 2: Convert to fraction form
   1,557.71/2,149.82 = 885.61/x
3. Step 3: Cross multiply
   1,557.71x = 2,149.82 × 885.61
4. Step 4: Simplify right side
   1,557.71x = 1,903,902.09
5. Step 5: Solve for x
   x = 1,903,902.09/1,557.71
6. Step 6: Final answer
   x = 1,222.25