Finding the Fourth Proportional to 3,085.78, 4,260.24 and 2,421.04

Step by Step Solution

1. Step 1: Write the proportion equation
   3,085.78 : 4,260.24 = 2,421.04 : x
2. Step 2: Convert to fraction form
   3,085.78/4,260.24 = 2,421.04/x
3. Step 3: Cross multiply
   3,085.78x = 4,260.24 × 2,421.04
4. Step 4: Simplify right side
   3,085.78x = 10,314,211.45
5. Step 5: Solve for x
   x = 10,314,211.45/3,085.78
6. Step 6: Final answer
   x = 3,342.50