Finding the Fourth Proportional to 2,900.68, 4,351 and 820.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,900.68 : 4,351 = 820.72 : x
2. Step 2: Convert to fraction form
   2,900.68/4,351 = 820.72/x
3. Step 3: Cross multiply
   2,900.68x = 4,351 × 820.72
4. Step 4: Simplify right side
   2,900.68x = 3,570,952.72
5. Step 5: Solve for x
   x = 3,570,952.72/2,900.68
6. Step 6: Final answer
   x = 1,231.07