Finding the Fourth Proportional to 2,900.36, 4,350.69 and 820.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,900.36 : 4,350.69 = 820.53 : x
2. Step 2: Convert to fraction form
   2,900.36/4,350.69 = 820.53/x
3. Step 3: Cross multiply
   2,900.36x = 4,350.69 × 820.53
4. Step 4: Simplify right side
   2,900.36x = 3,569,871.67
5. Step 5: Solve for x
   x = 3,569,871.67/2,900.36
6. Step 6: Final answer
   x = 1,230.84