Finding the Fourth Proportional to 81,991.94, 123,064.79 and 42,040.69

Step by Step Solution

1. Step 1: Write the proportion equation
   81,991.94 : 123,064.79 = 42,040.69 : x
2. Step 2: Convert to fraction form
   81,991.94/123,064.79 = 42,040.69/x
3. Step 3: Cross multiply
   81,991.94x = 123,064.79 × 42,040.69
4. Step 4: Simplify right side
   81,991.94x = 5,173,728,168.44
5. Step 5: Solve for x
   x = 5,173,728,168.44/81,991.94
6. Step 6: Final answer
   x = 63,100.45