Finding the Fourth Proportional to 78,679.35, 108,578.73 and 42,869.34

Step by Step Solution

1. Step 1: Write the proportion equation
   78,679.35 : 108,578.73 = 42,869.34 : x
2. Step 2: Convert to fraction form
   78,679.35/108,578.73 = 42,869.34/x
3. Step 3: Cross multiply
   78,679.35x = 108,578.73 × 42,869.34
4. Step 4: Simplify right side
   78,679.35x = 4,654,698,493.14
5. Step 5: Solve for x
   x = 4,654,698,493.14/78,679.35
6. Step 6: Final answer
   x = 59,160.36