Finding the Fourth Proportional to 3,872.72, 5,808.94 and 1,240.39

Step by Step Solution

1. Step 1: Write the proportion equation
   3,872.72 : 5,808.94 = 1,240.39 : x
2. Step 2: Convert to fraction form
   3,872.72/5,808.94 = 1,240.39/x
3. Step 3: Cross multiply
   3,872.72x = 5,808.94 × 1,240.39
4. Step 4: Simplify right side
   3,872.72x = 7,205,336.56
5. Step 5: Solve for x
   x = 7,205,336.56/3,872.72
6. Step 6: Final answer
   x = 1,860.54