Finding the Fourth Proportional to 2,635.86, 3,953.71 and 688.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,635.86 : 3,953.71 = 688.06 : x
2. Step 2: Convert to fraction form
   2,635.86/3,953.71 = 688.06/x
3. Step 3: Cross multiply
   2,635.86x = 3,953.71 × 688.06
4. Step 4: Simplify right side
   2,635.86x = 2,720,378.10
5. Step 5: Solve for x
   x = 2,720,378.10/2,635.86
6. Step 6: Final answer
   x = 1,032.06