Finding the Fourth Proportional to 78,099.59, 107,777.28 and 42,289.49

Step by Step Solution

1. Step 1: Write the proportion equation
   78,099.59 : 107,777.28 = 42,289.49 : x
2. Step 2: Convert to fraction form
   78,099.59/107,777.28 = 42,289.49/x
3. Step 3: Cross multiply
   78,099.59x = 107,777.28 × 42,289.49
4. Step 4: Simplify right side
   78,099.59x = 4,557,846,632.82
5. Step 5: Solve for x
   x = 4,557,846,632.82/78,099.59
6. Step 6: Final answer
   x = 58,359.42