Finding the Fourth Proportional to 1,557.91, 2,149.89 and 885.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,557.91 : 2,149.89 = 885.71 : x
2. Step 2: Convert to fraction form
   1,557.91/2,149.89 = 885.71/x
3. Step 3: Cross multiply
   1,557.91x = 2,149.89 × 885.71
4. Step 4: Simplify right side
   1,557.91x = 1,904,179.07
5. Step 5: Solve for x
   x = 1,904,179.07/1,557.91
6. Step 6: Final answer
   x = 1,222.27