Finding the Fourth Proportional to 42,559.92, 63,850.22 and 12,978.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42,559.92 : 63,850.22 = 12,978.28 : x
2. Step 2: Convert to fraction form
   42,559.92/63,850.22 = 12,978.28/x
3. Step 3: Cross multiply
   42,559.92x = 63,850.22 × 12,978.28
4. Step 4: Simplify right side
   42,559.92x = 828,666,033.22
5. Step 5: Solve for x
   x = 828,666,033.22/42,559.92
6. Step 6: Final answer
   x = 19,470.57