Finding the Fourth Proportional to 258,482.99, 387,724.62 and 81,003.89

Step by Step Solution

1. Step 1: Write the proportion equation
   258,482.99 : 387,724.62 = 81,003.89 : x
2. Step 2: Convert to fraction form
   258,482.99/387,724.62 = 81,003.89/x
3. Step 3: Cross multiply
   258,482.99x = 387,724.62 × 81,003.89
4. Step 4: Simplify right side
   258,482.99x = 31,407,200,530.15
5. Step 5: Solve for x
   x = 31,407,200,530.15/258,482.99
6. Step 6: Final answer
   x = 121,505.87