Finding the Fourth Proportional to 258,706.56, 388,118.23 and 78,808.09

Step by Step Solution

1. Step 1: Write the proportion equation
   258,706.56 : 388,118.23 = 78,808.09 : x
2. Step 2: Convert to fraction form
   258,706.56/388,118.23 = 78,808.09/x
3. Step 3: Cross multiply
   258,706.56x = 388,118.23 × 78,808.09
4. Step 4: Simplify right side
   258,706.56x = 30,586,856,404.18
5. Step 5: Solve for x
   x = 30,586,856,404.18/258,706.56
6. Step 6: Final answer
   x = 118,229.92