Finding the Fourth Proportional to 19,422.24, 29,147.40 and 7,728.72

Step by Step Solution

1. Step 1: Write the proportion equation
   19,422.24 : 29,147.40 = 7,728.72 : x
2. Step 2: Convert to fraction form
   19,422.24/29,147.40 = 7,728.72/x
3. Step 3: Cross multiply
   19,422.24x = 29,147.40 × 7,728.72
4. Step 4: Simplify right side
   19,422.24x = 225,272,093.33
5. Step 5: Solve for x
   x = 225,272,093.33/19,422.24
6. Step 6: Final answer
   x = 11,598.67