Finding the Fourth Proportional to 30,676.48, 42,274.56 and 21,829.12

Step by Step Solution

1. Step 1: Write the proportion equation
   30,676.48 : 42,274.56 = 21,829.12 : x
2. Step 2: Convert to fraction form
   30,676.48/42,274.56 = 21,829.12/x
3. Step 3: Cross multiply
   30,676.48x = 42,274.56 × 21,829.12
4. Step 4: Simplify right side
   30,676.48x = 922,816,443.19
5. Step 5: Solve for x
   x = 922,816,443.19/30,676.48
6. Step 6: Final answer
   x = 30,082.21