Finding the Fourth Proportional to 78,757.20, 108,684.99 and 42,947.28

Step by Step Solution

1. Step 1: Write the proportion equation
   78,757.20 : 108,684.99 = 42,947.28 : x
2. Step 2: Convert to fraction form
   78,757.20/108,684.99 = 42,947.28/x
3. Step 3: Cross multiply
   78,757.20x = 108,684.99 × 42,947.28
4. Step 4: Simplify right side
   78,757.20x = 4,667,724,697.33
5. Step 5: Solve for x
   x = 4,667,724,697.33/78,757.20
6. Step 6: Final answer
   x = 59,267.28