Finding the Fourth Proportional to 2,947, 4,421.72 and 1,216.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,947 : 4,421.72 = 1,216.84 : x
2. Step 2: Convert to fraction form
   2,947/4,421.72 = 1,216.84/x
3. Step 3: Cross multiply
   2,947x = 4,421.72 × 1,216.84
4. Step 4: Simplify right side
   2,947x = 5,380,525.76
5. Step 5: Solve for x
   x = 5,380,525.76/2,947
6. Step 6: Final answer
   x = 1,825.76