Finding the Fourth Proportional to 78,789.71, 108,729.62 and 42,979.73

Step by Step Solution

1. Step 1: Write the proportion equation
   78,789.71 : 108,729.62 = 42,979.73 : x
2. Step 2: Convert to fraction form
   78,789.71/108,729.62 = 42,979.73/x
3. Step 3: Cross multiply
   78,789.71x = 108,729.62 × 42,979.73
4. Step 4: Simplify right side
   78,789.71x = 4,673,169,113.23
5. Step 5: Solve for x
   x = 4,673,169,113.23/78,789.71
6. Step 6: Final answer
   x = 59,311.92