Finding the Fourth Proportional to 3,320.50, 4,978.90 and 1,539.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,320.50 : 4,978.90 = 1,539.61 : x
2. Step 2: Convert to fraction form
   3,320.50/4,978.90 = 1,539.61/x
3. Step 3: Cross multiply
   3,320.50x = 4,978.90 × 1,539.61
4. Step 4: Simplify right side
   3,320.50x = 7,665,564.23
5. Step 5: Solve for x
   x = 7,665,564.23/3,320.50
6. Step 6: Final answer
   x = 2,308.56