Finding the Fourth Proportional to 1,801.61, 2,488.27 and 1,211.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,801.61 : 2,488.27 = 1,211.12 : x
2. Step 2: Convert to fraction form
   1,801.61/2,488.27 = 1,211.12/x
3. Step 3: Cross multiply
   1,801.61x = 2,488.27 × 1,211.12
4. Step 4: Simplify right side
   1,801.61x = 3,013,593.56
5. Step 5: Solve for x
   x = 3,013,593.56/1,801.61
6. Step 6: Final answer
   x = 1,672.72