Finding the Fourth Proportional to 19,663.38, 29,499.72 and 8,572.05

Step by Step Solution

1. Step 1: Write the proportion equation
   19,663.38 : 29,499.72 = 8,572.05 : x
2. Step 2: Convert to fraction form
   19,663.38/29,499.72 = 8,572.05/x
3. Step 3: Cross multiply
   19,663.38x = 29,499.72 × 8,572.05
4. Step 4: Simplify right side
   19,663.38x = 252,873,074.83
5. Step 5: Solve for x
   x = 252,873,074.83/19,663.38
6. Step 6: Final answer
   x = 12,860.10