Finding the Fourth Proportional to 82,118.60, 123,139.59 and 42,665.12

Step by Step Solution

1. Step 1: Write the proportion equation
   82,118.60 : 123,139.59 = 42,665.12 : x
2. Step 2: Convert to fraction form
   82,118.60/123,139.59 = 42,665.12/x
3. Step 3: Cross multiply
   82,118.60x = 123,139.59 × 42,665.12
4. Step 4: Simplify right side
   82,118.60x = 5,253,764,768.40
5. Step 5: Solve for x
   x = 5,253,764,768.40/82,118.60
6. Step 6: Final answer
   x = 63,977.77