Finding the Fourth Proportional to 42,361.60, 63,513.60 and 20,185.60

Step by Step Solution

1. Step 1: Write the proportion equation
   42,361.60 : 63,513.60 = 20,185.60 : x
2. Step 2: Convert to fraction form
   42,361.60/63,513.60 = 20,185.60/x
3. Step 3: Cross multiply
   42,361.60x = 63,513.60 × 20,185.60
4. Step 4: Simplify right side
   42,361.60x = 1,282,060,124.16
5. Step 5: Solve for x
   x = 1,282,060,124.16/42,361.60
6. Step 6: Final answer
   x = 30,264.68