Finding the Fourth Proportional to 67,620.43, 101,439.87 and 28,168.31

Step by Step Solution

1. Step 1: Write the proportion equation
   67,620.43 : 101,439.87 = 28,168.31 : x
2. Step 2: Convert to fraction form
   67,620.43/101,439.87 = 28,168.31/x
3. Step 3: Cross multiply
   67,620.43x = 101,439.87 × 28,168.31
4. Step 4: Simplify right side
   67,620.43x = 2,857,389,852.49
5. Step 5: Solve for x
   x = 2,857,389,852.49/67,620.43
6. Step 6: Final answer
   x = 42,256.31