Finding the Fourth Proportional to 1,665.89, 2,498.11 and 885.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.89 : 2,498.11 = 885.71 : x
2. Step 2: Convert to fraction form
   1,665.89/2,498.11 = 885.71/x
3. Step 3: Cross multiply
   1,665.89x = 2,498.11 × 885.71
4. Step 4: Simplify right side
   1,665.89x = 2,212,601.01
5. Step 5: Solve for x
   x = 2,212,601.01/1,665.89
6. Step 6: Final answer
   x = 1,328.18