Finding the Fourth Proportional to 82,399.80, 123,570.90 and 42,943.80

Step by Step Solution

1. Step 1: Write the proportion equation
   82,399.80 : 123,570.90 = 42,943.80 : x
2. Step 2: Convert to fraction form
   82,399.80/123,570.90 = 42,943.80/x
3. Step 3: Cross multiply
   82,399.80x = 123,570.90 × 42,943.80
4. Step 4: Simplify right side
   82,399.80x = 5,306,604,015.42
5. Step 5: Solve for x
   x = 5,306,604,015.42/82,399.80
6. Step 6: Final answer
   x = 64,400.69