Finding the Fourth Proportional to 78,208.92, 107,928.88 and 42,399.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,208.92 : 107,928.88 = 42,399.50 : x
2. Step 2: Convert to fraction form
   78,208.92/107,928.88 = 42,399.50/x
3. Step 3: Cross multiply
   78,208.92x = 107,928.88 × 42,399.50
4. Step 4: Simplify right side
   78,208.92x = 4,576,130,547.56
5. Step 5: Solve for x
   x = 4,576,130,547.56/78,208.92
6. Step 6: Final answer
   x = 58,511.62