Finding the Fourth Proportional to 3,391.12, 4,678.18 and 2,196.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,391.12 : 4,678.18 = 2,196.50 : x
2. Step 2: Convert to fraction form
   3,391.12/4,678.18 = 2,196.50/x
3. Step 3: Cross multiply
   3,391.12x = 4,678.18 × 2,196.50
4. Step 4: Simplify right side
   3,391.12x = 10,275,641.45
5. Step 5: Solve for x
   x = 10,275,641.45/3,391.12
6. Step 6: Final answer
   x = 3,030.16