Finding the Fourth Proportional to 2,612.30, 3,918.38 and 637.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,612.30 : 3,918.38 = 637.92 : x
2. Step 2: Convert to fraction form
   2,612.30/3,918.38 = 637.92/x
3. Step 3: Cross multiply
   2,612.30x = 3,918.38 × 637.92
4. Step 4: Simplify right side
   2,612.30x = 2,499,609.78
5. Step 5: Solve for x
   x = 2,499,609.78/2,612.30
6. Step 6: Final answer
   x = 956.86