Finding the Fourth Proportional to 19,662.20, 29,468.69 and 15,485.72

Step by Step Solution

1. Step 1: Write the proportion equation
   19,662.20 : 29,468.69 = 15,485.72 : x
2. Step 2: Convert to fraction form
   19,662.20/29,468.69 = 15,485.72/x
3. Step 3: Cross multiply
   19,662.20x = 29,468.69 × 15,485.72
4. Step 4: Simplify right side
   19,662.20x = 456,343,825.91
5. Step 5: Solve for x
   x = 456,343,825.91/19,662.20
6. Step 6: Final answer
   x = 23,209.19