Finding the Fourth Proportional to 19,311.28, 28,950.52 and 7,632.72

Step by Step Solution

1. Step 1: Write the proportion equation
   19,311.28 : 28,950.52 = 7,632.72 : x
2. Step 2: Convert to fraction form
   19,311.28/28,950.52 = 7,632.72/x
3. Step 3: Cross multiply
   19,311.28x = 28,950.52 × 7,632.72
4. Step 4: Simplify right side
   19,311.28x = 220,971,213.01
5. Step 5: Solve for x
   x = 220,971,213.01/19,311.28
6. Step 6: Final answer
   x = 11,442.60