Finding the Fourth Proportional to 78,105.40, 107,785.55 and 42,295.47

Step by Step Solution

1. Step 1: Write the proportion equation
   78,105.40 : 107,785.55 = 42,295.47 : x
2. Step 2: Convert to fraction form
   78,105.40/107,785.55 = 42,295.47/x
3. Step 3: Cross multiply
   78,105.40x = 107,785.55 × 42,295.47
4. Step 4: Simplify right side
   78,105.40x = 4,558,840,198.00
5. Step 5: Solve for x
   x = 4,558,840,198.00/78,105.40
6. Step 6: Final answer
   x = 58,367.80