Finding the Fourth Proportional to 2,505.42, 3,455.24 and 1,620.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,505.42 : 3,455.24 = 1,620.30 : x
2. Step 2: Convert to fraction form
   2,505.42/3,455.24 = 1,620.30/x
3. Step 3: Cross multiply
   2,505.42x = 3,455.24 × 1,620.30
4. Step 4: Simplify right side
   2,505.42x = 5,598,517.27
5. Step 5: Solve for x
   x = 5,598,517.27/2,505.42
6. Step 6: Final answer
   x = 2,234.56