Finding the Fourth Proportional to 2,631.69, 3,940.65 and 2,553.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,631.69 : 3,940.65 = 2,553.76 : x
2. Step 2: Convert to fraction form
   2,631.69/3,940.65 = 2,553.76/x
3. Step 3: Cross multiply
   2,631.69x = 3,940.65 × 2,553.76
4. Step 4: Simplify right side
   2,631.69x = 10,063,479.27
5. Step 5: Solve for x
   x = 10,063,479.27/2,631.69
6. Step 6: Final answer
   x = 3,823.96