Finding the Fourth Proportional to 42,007.12, 63,018.96 and 12,021.64

Step by Step Solution

1. Step 1: Write the proportion equation
   42,007.12 : 63,018.96 = 12,021.64 : x
2. Step 2: Convert to fraction form
   42,007.12/63,018.96 = 12,021.64/x
3. Step 3: Cross multiply
   42,007.12x = 63,018.96 × 12,021.64
4. Step 4: Simplify right side
   42,007.12x = 757,591,250.29
5. Step 5: Solve for x
   x = 757,591,250.29/42,007.12
6. Step 6: Final answer
   x = 18,034.83