Finding the Fourth Proportional to 1,488.89, 2,231.82 and 1,211.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.89 : 2,231.82 = 1,211.80 : x
2. Step 2: Convert to fraction form
   1,488.89/2,231.82 = 1,211.80/x
3. Step 3: Cross multiply
   1,488.89x = 2,231.82 × 1,211.80
4. Step 4: Simplify right side
   1,488.89x = 2,704,513.90
5. Step 5: Solve for x
   x = 2,704,513.90/1,488.89
6. Step 6: Final answer
   x = 1,816.46