Finding the Fourth Proportional to 3,678.18, 5,506.32 and 2,212.89

Step by Step Solution

1. Step 1: Write the proportion equation
   3,678.18 : 5,506.32 = 2,212.89 : x
2. Step 2: Convert to fraction form
   3,678.18/5,506.32 = 2,212.89/x
3. Step 3: Cross multiply
   3,678.18x = 5,506.32 × 2,212.89
4. Step 4: Simplify right side
   3,678.18x = 12,184,880.46
5. Step 5: Solve for x
   x = 12,184,880.46/3,678.18
6. Step 6: Final answer
   x = 3,312.75