Finding the Fourth Proportional to 258,826.42, 388,256.37 and 81,340.84

Step by Step Solution

1. Step 1: Write the proportion equation
   258,826.42 : 388,256.37 = 81,340.84 : x
2. Step 2: Convert to fraction form
   258,826.42/388,256.37 = 81,340.84/x
3. Step 3: Cross multiply
   258,826.42x = 388,256.37 × 81,340.84
4. Step 4: Simplify right side
   258,826.42x = 31,581,099,271.15
5. Step 5: Solve for x
   x = 31,581,099,271.15/258,826.42
6. Step 6: Final answer
   x = 122,016.52