Finding the Fourth Proportional to 80,418.72, 120,505.07 and 42,984.12

Step by Step Solution

1. Step 1: Write the proportion equation
   80,418.72 : 120,505.07 = 42,984.12 : x
2. Step 2: Convert to fraction form
   80,418.72/120,505.07 = 42,984.12/x
3. Step 3: Cross multiply
   80,418.72x = 120,505.07 × 42,984.12
4. Step 4: Simplify right side
   80,418.72x = 5,179,804,029.22
5. Step 5: Solve for x
   x = 5,179,804,029.22/80,418.72
6. Step 6: Final answer
   x = 64,410.42