Finding the Fourth Proportional to 11,209.89, 15,469.05 and 6,429.58

Step by Step Solution

1. Step 1: Write the proportion equation
   11,209.89 : 15,469.05 = 6,429.58 : x
2. Step 2: Convert to fraction form
   11,209.89/15,469.05 = 6,429.58/x
3. Step 3: Cross multiply
   11,209.89x = 15,469.05 × 6,429.58
4. Step 4: Simplify right side
   11,209.89x = 99,459,494.50
5. Step 5: Solve for x
   x = 99,459,494.50/11,209.89
6. Step 6: Final answer
   x = 8,872.48