Finding the Fourth Proportional to 2,376.10, 3,564.15 and 644.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,376.10 : 3,564.15 = 644.72 : x
2. Step 2: Convert to fraction form
   2,376.10/3,564.15 = 644.72/x
3. Step 3: Cross multiply
   2,376.10x = 3,564.15 × 644.72
4. Step 4: Simplify right side
   2,376.10x = 2,297,892.15
5. Step 5: Solve for x
   x = 2,297,892.15/2,376.10
6. Step 6: Final answer
   x = 967.09