Finding the Fourth Proportional to 82,392.80, 123,560.40 and 42,936.80

Step by Step Solution

1. Step 1: Write the proportion equation
   82,392.80 : 123,560.40 = 42,936.80 : x
2. Step 2: Convert to fraction form
   82,392.80/123,560.40 = 42,936.80/x
3. Step 3: Cross multiply
   82,392.80x = 123,560.40 × 42,936.80
4. Step 4: Simplify right side
   82,392.80x = 5,305,288,182.72
5. Step 5: Solve for x
   x = 5,305,288,182.72/82,392.80
6. Step 6: Final answer
   x = 64,390.19