Finding the Fourth Proportional to 42,270.71, 63,406.61 and 20,086.25

Step by Step Solution

1. Step 1: Write the proportion equation
   42,270.71 : 63,406.61 = 20,086.25 : x
2. Step 2: Convert to fraction form
   42,270.71/63,406.61 = 20,086.25/x
3. Step 3: Cross multiply
   42,270.71x = 63,406.61 × 20,086.25
4. Step 4: Simplify right side
   42,270.71x = 1,273,600,919.68
5. Step 5: Solve for x
   x = 1,273,600,919.68/42,270.71
6. Step 6: Final answer
   x = 30,129.63