Finding the Fourth Proportional to 2,900.52, 4,350.42 and 820.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,900.52 : 4,350.42 = 820.68 : x
2. Step 2: Convert to fraction form
   2,900.52/4,350.42 = 820.68/x
3. Step 3: Cross multiply
   2,900.52x = 4,350.42 × 820.68
4. Step 4: Simplify right side
   2,900.52x = 3,570,302.69
5. Step 5: Solve for x
   x = 3,570,302.69/2,900.52
6. Step 6: Final answer
   x = 1,230.92