Finding the Fourth Proportional to 1,813.89, 2,503.17 and 985.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,813.89 : 2,503.17 = 985.89 : x
2. Step 2: Convert to fraction form
   1,813.89/2,503.17 = 985.89/x
3. Step 3: Cross multiply
   1,813.89x = 2,503.17 × 985.89
4. Step 4: Simplify right side
   1,813.89x = 2,467,850.27
5. Step 5: Solve for x
   x = 2,467,850.27/1,813.89
6. Step 6: Final answer
   x = 1,360.53