Finding the Fourth Proportional to 2,946.38, 4,421.59 and 1,215

Step by Step Solution

1. Step 1: Write the proportion equation
   2,946.38 : 4,421.59 = 1,215 : x
2. Step 2: Convert to fraction form
   2,946.38/4,421.59 = 1,215/x
3. Step 3: Cross multiply
   2,946.38x = 4,421.59 × 1,215
4. Step 4: Simplify right side
   2,946.38x = 5,372,228.81
5. Step 5: Solve for x
   x = 5,372,228.81/2,946.38
6. Step 6: Final answer
   x = 1,823.34