Finding the Fourth Proportional to 67,391.52, 101,106.72 and 20,651.28

Step by Step Solution

1. Step 1: Write the proportion equation
   67,391.52 : 101,106.72 = 20,651.28 : x
2. Step 2: Convert to fraction form
   67,391.52/101,106.72 = 20,651.28/x
3. Step 3: Cross multiply
   67,391.52x = 101,106.72 × 20,651.28
4. Step 4: Simplify right side
   67,391.52x = 2,087,983,184.60
5. Step 5: Solve for x
   x = 2,087,983,184.60/67,391.52
6. Step 6: Final answer
   x = 30,982.88