Finding the Fourth Proportional to 42,745.76, 64,131.60 and 30,289.92

Step by Step Solution

1. Step 1: Write the proportion equation
   42,745.76 : 64,131.60 = 30,289.92 : x
2. Step 2: Convert to fraction form
   42,745.76/64,131.60 = 30,289.92/x
3. Step 3: Cross multiply
   42,745.76x = 64,131.60 × 30,289.92
4. Step 4: Simplify right side
   42,745.76x = 1,942,541,033.47
5. Step 5: Solve for x
   x = 1,942,541,033.47/42,745.76
6. Step 6: Final answer
   x = 45,444.06