Finding the Fourth Proportional to 258,881.58, 388,322.37 and 81,404.10

Step by Step Solution

1. Step 1: Write the proportion equation
   258,881.58 : 388,322.37 = 81,404.10 : x
2. Step 2: Convert to fraction form
   258,881.58/388,322.37 = 81,404.10/x
3. Step 3: Cross multiply
   258,881.58x = 388,322.37 × 81,404.10
4. Step 4: Simplify right side
   258,881.58x = 31,611,033,039.72
5. Step 5: Solve for x
   x = 31,611,033,039.72/258,881.58
6. Step 6: Final answer
   x = 122,106.15