Finding the Fourth Proportional to 42,422.62, 63,605.86 and 20,239.42

Step by Step Solution

1. Step 1: Write the proportion equation
   42,422.62 : 63,605.86 = 20,239.42 : x
2. Step 2: Convert to fraction form
   42,422.62/63,605.86 = 20,239.42/x
3. Step 3: Cross multiply
   42,422.62x = 63,605.86 × 20,239.42
4. Step 4: Simplify right side
   42,422.62x = 1,287,345,715.00
5. Step 5: Solve for x
   x = 1,287,345,715.00/42,422.62
6. Step 6: Final answer
   x = 30,345.74