Finding the Fourth Proportional to 67,978.43, 101,982.23 and 28,512.80

Step by Step Solution

1. Step 1: Write the proportion equation
   67,978.43 : 101,982.23 = 28,512.80 : x
2. Step 2: Convert to fraction form
   67,978.43/101,982.23 = 28,512.80/x
3. Step 3: Cross multiply
   67,978.43x = 101,982.23 × 28,512.80
4. Step 4: Simplify right side
   67,978.43x = 2,907,798,275.07
5. Step 5: Solve for x
   x = 2,907,798,275.07/67,978.43
6. Step 6: Final answer
   x = 42,775.31