Finding the Fourth Proportional to 12,209.89, 16,849.98 and 6,905.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,209.89 : 16,849.98 = 6,905.50 : x
2. Step 2: Convert to fraction form
   12,209.89/16,849.98 = 6,905.50/x
3. Step 3: Cross multiply
   12,209.89x = 16,849.98 × 6,905.50
4. Step 4: Simplify right side
   12,209.89x = 116,357,536.89
5. Step 5: Solve for x
   x = 116,357,536.89/12,209.89
6. Step 6: Final answer
   x = 9,529.78