Finding the Fourth Proportional to 42,105.76, 63,162.40 and 12,120.16

Step by Step Solution

1. Step 1: Write the proportion equation
   42,105.76 : 63,162.40 = 12,120.16 : x
2. Step 2: Convert to fraction form
   42,105.76/63,162.40 = 12,120.16/x
3. Step 3: Cross multiply
   42,105.76x = 63,162.40 × 12,120.16
4. Step 4: Simplify right side
   42,105.76x = 765,538,393.98
5. Step 5: Solve for x
   x = 765,538,393.98/42,105.76
6. Step 6: Final answer
   x = 18,181.32