Finding the Fourth Proportional to 67,185.42, 100,783.71 and 20,438.70

Step by Step Solution

1. Step 1: Write the proportion equation
   67,185.42 : 100,783.71 = 20,438.70 : x
2. Step 2: Convert to fraction form
   67,185.42/100,783.71 = 20,438.70/x
3. Step 3: Cross multiply
   67,185.42x = 100,783.71 × 20,438.70
4. Step 4: Simplify right side
   67,185.42x = 2,059,888,013.58
5. Step 5: Solve for x
   x = 2,059,888,013.58/67,185.42
6. Step 6: Final answer
   x = 30,659.75