Finding the Fourth Proportional to 78,680.84, 108,579.58 and 42,870.86

Step by Step Solution

1. Step 1: Write the proportion equation
   78,680.84 : 108,579.58 = 42,870.86 : x
2. Step 2: Convert to fraction form
   78,680.84/108,579.58 = 42,870.86/x
3. Step 3: Cross multiply
   78,680.84x = 108,579.58 × 42,870.86
4. Step 4: Simplify right side
   78,680.84x = 4,654,899,517.16
5. Step 5: Solve for x
   x = 4,654,899,517.16/78,680.84
6. Step 6: Final answer
   x = 59,161.79