Finding the Fourth Proportional to 10,142.94, 15,215.37 and 3,985.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,142.94 : 15,215.37 = 3,985.50 : x
2. Step 2: Convert to fraction form
   10,142.94/15,215.37 = 3,985.50/x
3. Step 3: Cross multiply
   10,142.94x = 15,215.37 × 3,985.50
4. Step 4: Simplify right side
   10,142.94x = 60,640,857.14
5. Step 5: Solve for x
   x = 60,640,857.14/10,142.94
6. Step 6: Final answer
   x = 5,978.63