Finding the Fourth Proportional to 78,209.18, 107,929.22 and 42,399.75

Step by Step Solution

1. Step 1: Write the proportion equation
   78,209.18 : 107,929.22 = 42,399.75 : x
2. Step 2: Convert to fraction form
   78,209.18/107,929.22 = 42,399.75/x
3. Step 3: Cross multiply
   78,209.18x = 107,929.22 × 42,399.75
4. Step 4: Simplify right side
   78,209.18x = 4,576,171,945.70
5. Step 5: Solve for x
   x = 4,576,171,945.70/78,209.18
6. Step 6: Final answer
   x = 58,511.95