Finding the Fourth Proportional to 2,491.10, 3,736.69 and 642.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,491.10 : 3,736.69 = 642.25 : x
2. Step 2: Convert to fraction form
   2,491.10/3,736.69 = 642.25/x
3. Step 3: Cross multiply
   2,491.10x = 3,736.69 × 642.25
4. Step 4: Simplify right side
   2,491.10x = 2,399,889.15
5. Step 5: Solve for x
   x = 2,399,889.15/2,491.10
6. Step 6: Final answer
   x = 963.39