Finding the Fourth Proportional to 258,535.42, 387,803.25 and 81,056.27

Step by Step Solution

1. Step 1: Write the proportion equation
   258,535.42 : 387,803.25 = 81,056.27 : x
2. Step 2: Convert to fraction form
   258,535.42/387,803.25 = 81,056.27/x
3. Step 3: Cross multiply
   258,535.42x = 387,803.25 × 81,056.27
4. Step 4: Simplify right side
   258,535.42x = 31,433,884,938.88
5. Step 5: Solve for x
   x = 31,433,884,938.88/258,535.42
6. Step 6: Final answer
   x = 121,584.44