Finding the Fourth Proportional to 3,678.72, 5,522.76 and 2,385.60

Step by Step Solution

1. Step 1: Write the proportion equation
   3,678.72 : 5,522.76 = 2,385.60 : x
2. Step 2: Convert to fraction form
   3,678.72/5,522.76 = 2,385.60/x
3. Step 3: Cross multiply
   3,678.72x = 5,522.76 × 2,385.60
4. Step 4: Simplify right side
   3,678.72x = 13,175,096.26
5. Step 5: Solve for x
   x = 13,175,096.26/3,678.72
6. Step 6: Final answer
   x = 3,581.43