Finding the Fourth Proportional to 2,672.72, 4,007.16 and 1,211.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,672.72 : 4,007.16 = 1,211.12 : x
2. Step 2: Convert to fraction form
   2,672.72/4,007.16 = 1,211.12/x
3. Step 3: Cross multiply
   2,672.72x = 4,007.16 × 1,211.12
4. Step 4: Simplify right side
   2,672.72x = 4,853,151.62
5. Step 5: Solve for x
   x = 4,853,151.62/2,672.72
6. Step 6: Final answer
   x = 1,815.81