Finding the Fourth Proportional to 1,665.09, 2,498.63 and 885.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.09 : 2,498.63 = 885.06 : x
2. Step 2: Convert to fraction form
   1,665.09/2,498.63 = 885.06/x
3. Step 3: Cross multiply
   1,665.09x = 2,498.63 × 885.06
4. Step 4: Simplify right side
   1,665.09x = 2,211,437.47
5. Step 5: Solve for x
   x = 2,211,437.47/1,665.09
6. Step 6: Final answer
   x = 1,328.12