Finding the Fourth Proportional to 78,209.70, 107,928.72 and 42,398.79

Step by Step Solution

1. Step 1: Write the proportion equation
   78,209.70 : 107,928.72 = 42,398.79 : x
2. Step 2: Convert to fraction form
   78,209.70/107,928.72 = 42,398.79/x
3. Step 3: Cross multiply
   78,209.70x = 107,928.72 × 42,398.79
4. Step 4: Simplify right side
   78,209.70x = 4,576,047,134.25
5. Step 5: Solve for x
   x = 4,576,047,134.25/78,209.70
6. Step 6: Final answer
   x = 58,509.97