Finding the Fourth Proportional to 78,680.36, 108,580.15 and 42,870.36

Step by Step Solution

1. Step 1: Write the proportion equation
   78,680.36 : 108,580.15 = 42,870.36 : x
2. Step 2: Convert to fraction form
   78,680.36/108,580.15 = 42,870.36/x
3. Step 3: Cross multiply
   78,680.36x = 108,580.15 × 42,870.36
4. Step 4: Simplify right side
   78,680.36x = 4,654,870,338.97
5. Step 5: Solve for x
   x = 4,654,870,338.97/78,680.36
6. Step 6: Final answer
   x = 59,161.78