Finding the Fourth Proportional to 78,679.71, 108,576.63 and 42,869.97

Step by Step Solution

1. Step 1: Write the proportion equation
   78,679.71 : 108,576.63 = 42,869.97 : x
2. Step 2: Convert to fraction form
   78,679.71/108,576.63 = 42,869.97/x
3. Step 3: Cross multiply
   78,679.71x = 108,576.63 × 42,869.97
4. Step 4: Simplify right side
   78,679.71x = 4,654,676,870.80
5. Step 5: Solve for x
   x = 4,654,676,870.80/78,679.71
6. Step 6: Final answer
   x = 59,159.81