Finding the Fourth Proportional to 78,680.49, 108,578.48 and 42,870.39

Step by Step Solution

1. Step 1: Write the proportion equation
   78,680.49 : 108,578.48 = 42,870.39 : x
2. Step 2: Convert to fraction form
   78,680.49/108,578.48 = 42,870.39/x
3. Step 3: Cross multiply
   78,680.49x = 108,578.48 × 42,870.39
4. Step 4: Simplify right side
   78,680.49x = 4,654,801,568.86
5. Step 5: Solve for x
   x = 4,654,801,568.86/78,680.49
6. Step 6: Final answer
   x = 59,160.81