Finding the Fourth Proportional to 20,272.69, 30,410.66 and 7,128.01

Step by Step Solution

1. Step 1: Write the proportion equation
   20,272.69 : 30,410.66 = 7,128.01 : x
2. Step 2: Convert to fraction form
   20,272.69/30,410.66 = 7,128.01/x
3. Step 3: Cross multiply
   20,272.69x = 30,410.66 × 7,128.01
4. Step 4: Simplify right side
   20,272.69x = 216,767,300.89
5. Step 5: Solve for x
   x = 216,767,300.89/20,272.69
6. Step 6: Final answer
   x = 10,692.58