Finding the Fourth Proportional to 2,429.12, 3,640.56 and 2,115.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,429.12 : 3,640.56 = 2,115.48 : x
2. Step 2: Convert to fraction form
   2,429.12/3,640.56 = 2,115.48/x
3. Step 3: Cross multiply
   2,429.12x = 3,640.56 × 2,115.48
4. Step 4: Simplify right side
   2,429.12x = 7,701,531.87
5. Step 5: Solve for x
   x = 7,701,531.87/2,429.12
6. Step 6: Final answer
   x = 3,170.50