Finding the Fourth Proportional to 78,789.70, 108,725.79 and 42,979.42

Step by Step Solution

1. Step 1: Write the proportion equation
   78,789.70 : 108,725.79 = 42,979.42 : x
2. Step 2: Convert to fraction form
   78,789.70/108,725.79 = 42,979.42/x
3. Step 3: Cross multiply
   78,789.70x = 108,725.79 × 42,979.42
4. Step 4: Simplify right side
   78,789.70x = 4,672,971,393.24
5. Step 5: Solve for x
   x = 4,672,971,393.24/78,789.70
6. Step 6: Final answer
   x = 59,309.42