Finding the Fourth Proportional to 42,005.12, 63,015.96 and 12,019.64

Step by Step Solution

1. Step 1: Write the proportion equation
   42,005.12 : 63,015.96 = 12,019.64 : x
2. Step 2: Convert to fraction form
   42,005.12/63,015.96 = 12,019.64/x
3. Step 3: Cross multiply
   42,005.12x = 63,015.96 × 12,019.64
4. Step 4: Simplify right side
   42,005.12x = 757,429,153.45
5. Step 5: Solve for x
   x = 757,429,153.45/42,005.12
6. Step 6: Final answer
   x = 18,031.83