Finding the Fourth Proportional to 12,405.50, 17,119.59 and 6,816.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,405.50 : 17,119.59 = 6,816.50 : x
2. Step 2: Convert to fraction form
   12,405.50/17,119.59 = 6,816.50/x
3. Step 3: Cross multiply
   12,405.50x = 17,119.59 × 6,816.50
4. Step 4: Simplify right side
   12,405.50x = 116,695,685.24
5. Step 5: Solve for x
   x = 116,695,685.24/12,405.50
6. Step 6: Final answer
   x = 9,406.77