Finding the Fourth Proportional to 42,012.20, 63,029.07 and 13,940.12

Step by Step Solution

1. Step 1: Write the proportion equation
   42,012.20 : 63,029.07 = 13,940.12 : x
2. Step 2: Convert to fraction form
   42,012.20/63,029.07 = 13,940.12/x
3. Step 3: Cross multiply
   42,012.20x = 63,029.07 × 13,940.12
4. Step 4: Simplify right side
   42,012.20x = 878,632,484.14
5. Step 5: Solve for x
   x = 878,632,484.14/42,012.20
6. Step 6: Final answer
   x = 20,913.75