Finding the Fourth Proportional to 67,321.40, 100,978.43 and 20,570.63

Step by Step Solution

1. Step 1: Write the proportion equation
   67,321.40 : 100,978.43 = 20,570.63 : x
2. Step 2: Convert to fraction form
   67,321.40/100,978.43 = 20,570.63/x
3. Step 3: Cross multiply
   67,321.40x = 100,978.43 × 20,570.63
4. Step 4: Simplify right side
   67,321.40x = 2,077,189,313.77
5. Step 5: Solve for x
   x = 2,077,189,313.77/67,321.40
6. Step 6: Final answer
   x = 30,854.82