Finding the Fourth Proportional to 42,219.88, 63,329.77 and 20,021.15

Step by Step Solution

1. Step 1: Write the proportion equation
   42,219.88 : 63,329.77 = 20,021.15 : x
2. Step 2: Convert to fraction form
   42,219.88/63,329.77 = 20,021.15/x
3. Step 3: Cross multiply
   42,219.88x = 63,329.77 × 20,021.15
4. Step 4: Simplify right side
   42,219.88x = 1,267,934,407.88
5. Step 5: Solve for x
   x = 1,267,934,407.88/42,219.88
6. Step 6: Final answer
   x = 30,031.69