Finding the Fourth Proportional to 78,399.79, 108,187.61 and 42,589.69

Step by Step Solution

1. Step 1: Write the proportion equation
   78,399.79 : 108,187.61 = 42,589.69 : x
2. Step 2: Convert to fraction form
   78,399.79/108,187.61 = 42,589.69/x
3. Step 3: Cross multiply
   78,399.79x = 108,187.61 × 42,589.69
4. Step 4: Simplify right side
   78,399.79x = 4,607,676,771.74
5. Step 5: Solve for x
   x = 4,607,676,771.74/78,399.79
6. Step 6: Final answer
   x = 58,771.54