Finding the Fourth Proportional to 82,396.80, 123,566.40 and 42,940.80

Step by Step Solution

1. Step 1: Write the proportion equation
   82,396.80 : 123,566.40 = 42,940.80 : x
2. Step 2: Convert to fraction form
   82,396.80/123,566.40 = 42,940.80/x
3. Step 3: Cross multiply
   82,396.80x = 123,566.40 × 42,940.80
4. Step 4: Simplify right side
   82,396.80x = 5,306,040,069.12
5. Step 5: Solve for x
   x = 5,306,040,069.12/82,396.80
6. Step 6: Final answer
   x = 64,396.19