Finding the Fourth Proportional to 10,419.80, 14,379.27 and 9,572.57

Step by Step Solution

1. Step 1: Write the proportion equation
   10,419.80 : 14,379.27 = 9,572.57 : x
2. Step 2: Convert to fraction form
   10,419.80/14,379.27 = 9,572.57/x
3. Step 3: Cross multiply
   10,419.80x = 14,379.27 × 9,572.57
4. Step 4: Simplify right side
   10,419.80x = 137,646,496.73
5. Step 5: Solve for x
   x = 137,646,496.73/10,419.80
6. Step 6: Final answer
   x = 13,210.09