Finding the Fourth Proportional to 2,636.07, 3,953.76 and 688.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,636.07 : 3,953.76 = 688.42 : x
2. Step 2: Convert to fraction form
   2,636.07/3,953.76 = 688.42/x
3. Step 3: Cross multiply
   2,636.07x = 3,953.76 × 688.42
4. Step 4: Simplify right side
   2,636.07x = 2,721,847.46
5. Step 5: Solve for x
   x = 2,721,847.46/2,636.07
6. Step 6: Final answer
   x = 1,032.54