Finding the Fourth Proportional to 2,556.79, 3,835.17 and 707.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,556.79 : 3,835.17 = 707.88 : x
2. Step 2: Convert to fraction form
   2,556.79/3,835.17 = 707.88/x
3. Step 3: Cross multiply
   2,556.79x = 3,835.17 × 707.88
4. Step 4: Simplify right side
   2,556.79x = 2,714,854.52
5. Step 5: Solve for x
   x = 2,714,854.52/2,556.79
6. Step 6: Final answer
   x = 1,061.82