Finding the Fourth Proportional to 78,099.31, 107,777.55 and 42,289.62

Step by Step Solution

1. Step 1: Write the proportion equation
   78,099.31 : 107,777.55 = 42,289.62 : x
2. Step 2: Convert to fraction form
   78,099.31/107,777.55 = 42,289.62/x
3. Step 3: Cross multiply
   78,099.31x = 107,777.55 × 42,289.62
4. Step 4: Simplify right side
   78,099.31x = 4,557,871,634.03
5. Step 5: Solve for x
   x = 4,557,871,634.03/78,099.31
6. Step 6: Final answer
   x = 58,359.95