Finding the Fourth Proportional to 67,321.52, 100,978.62 and 20,570.72

Step by Step Solution

1. Step 1: Write the proportion equation
   67,321.52 : 100,978.62 = 20,570.72 : x
2. Step 2: Convert to fraction form
   67,321.52/100,978.62 = 20,570.72/x
3. Step 3: Cross multiply
   67,321.52x = 100,978.62 × 20,570.72
4. Step 4: Simplify right side
   67,321.52x = 2,077,202,918.01
5. Step 5: Solve for x
   x = 2,077,202,918.01/67,321.52
6. Step 6: Final answer
   x = 30,854.96