Finding the Fourth Proportional to 78,680.71, 108,578.01 and 42,870.97

Step by Step Solution

1. Step 1: Write the proportion equation
   78,680.71 : 108,578.01 = 42,870.97 : x
2. Step 2: Convert to fraction form
   78,680.71/108,578.01 = 42,870.97/x
3. Step 3: Cross multiply
   78,680.71x = 108,578.01 × 42,870.97
4. Step 4: Simplify right side
   78,680.71x = 4,654,844,609.37
5. Step 5: Solve for x
   x = 4,654,844,609.37/78,680.71
6. Step 6: Final answer
   x = 59,161.19