Finding the Fourth Proportional to 258,674.56, 388,374.72 and 211,500.16

Step by Step Solution

1. Step 1: Write the proportion equation
   258,674.56 : 388,374.72 = 211,500.16 : x
2. Step 2: Convert to fraction form
   258,674.56/388,374.72 = 211,500.16/x
3. Step 3: Cross multiply
   258,674.56x = 388,374.72 × 211,500.16
4. Step 4: Simplify right side
   258,674.56x = 82,141,315,419.96
5. Step 5: Solve for x
   x = 82,141,315,419.96/258,674.56
6. Step 6: Final answer
   x = 317,546.94