Finding the Fourth Proportional to 10,558.44, 15,839.37 and 3,985.20

Step by Step Solution

1. Step 1: Write the proportion equation
   10,558.44 : 15,839.37 = 3,985.20 : x
2. Step 2: Convert to fraction form
   10,558.44/15,839.37 = 3,985.20/x
3. Step 3: Cross multiply
   10,558.44x = 15,839.37 × 3,985.20
4. Step 4: Simplify right side
   10,558.44x = 63,123,057.32
5. Step 5: Solve for x
   x = 63,123,057.32/10,558.44
6. Step 6: Final answer
   x = 5,978.45