Finding the Fourth Proportional to 8,139.40, 12,209.76 and 3,460.48

Step by Step Solution

1. Step 1: Write the proportion equation
   8,139.40 : 12,209.76 = 3,460.48 : x
2. Step 2: Convert to fraction form
   8,139.40/12,209.76 = 3,460.48/x
3. Step 3: Cross multiply
   8,139.40x = 12,209.76 × 3,460.48
4. Step 4: Simplify right side
   8,139.40x = 42,251,630.28
5. Step 5: Solve for x
   x = 42,251,630.28/8,139.40
6. Step 6: Final answer
   x = 5,191.00