Finding the Fourth Proportional to 42,936.09, 64,443.77 and 30,940.70

Step by Step Solution

1. Step 1: Write the proportion equation
   42,936.09 : 64,443.77 = 30,940.70 : x
2. Step 2: Convert to fraction form
   42,936.09/64,443.77 = 30,940.70/x
3. Step 3: Cross multiply
   42,936.09x = 64,443.77 × 30,940.70
4. Step 4: Simplify right side
   42,936.09x = 1,993,934,877.52
5. Step 5: Solve for x
   x = 1,993,934,877.52/42,936.09
6. Step 6: Final answer
   x = 46,439.60