Finding the Fourth Proportional to 42,388.96, 63,542.16 and 20,196.40

Step by Step Solution

1. Step 1: Write the proportion equation
   42,388.96 : 63,542.16 = 20,196.40 : x
2. Step 2: Convert to fraction form
   42,388.96/63,542.16 = 20,196.40/x
3. Step 3: Cross multiply
   42,388.96x = 63,542.16 × 20,196.40
4. Step 4: Simplify right side
   42,388.96x = 1,283,322,880.22
5. Step 5: Solve for x
   x = 1,283,322,880.22/42,388.96
6. Step 6: Final answer
   x = 30,274.93