Finding the Fourth Proportional to 10,558.16, 15,839.04 and 3,985.28

Step by Step Solution

1. Step 1: Write the proportion equation
   10,558.16 : 15,839.04 = 3,985.28 : x
2. Step 2: Convert to fraction form
   10,558.16/15,839.04 = 3,985.28/x
3. Step 3: Cross multiply
   10,558.16x = 15,839.04 × 3,985.28
4. Step 4: Simplify right side
   10,558.16x = 63,123,009.33
5. Step 5: Solve for x
   x = 63,123,009.33/10,558.16
6. Step 6: Final answer
   x = 5,978.60