Finding the Fourth Proportional to 20,422.76, 30,615.58 and 7,272.05

Step by Step Solution

1. Step 1: Write the proportion equation
   20,422.76 : 30,615.58 = 7,272.05 : x
2. Step 2: Convert to fraction form
   20,422.76/30,615.58 = 7,272.05/x
3. Step 3: Cross multiply
   20,422.76x = 30,615.58 × 7,272.05
4. Step 4: Simplify right side
   20,422.76x = 222,637,884.55
5. Step 5: Solve for x
   x = 222,637,884.55/20,422.76
6. Step 6: Final answer
   x = 10,901.46