Finding the Fourth Proportional to 8,985.69, 13,478.60 and 3,142.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,985.69 : 13,478.60 = 3,142.31 : x
2. Step 2: Convert to fraction form
   8,985.69/13,478.60 = 3,142.31/x
3. Step 3: Cross multiply
   8,985.69x = 13,478.60 × 3,142.31
4. Step 4: Simplify right side
   8,985.69x = 42,353,880.03
5. Step 5: Solve for x
   x = 42,353,880.03/8,985.69
6. Step 6: Final answer
   x = 4,713.48