Finding the Fourth Proportional to 259,659.50, 389,659.53 and 91,175.48

Step by Step Solution

1. Step 1: Write the proportion equation
   259,659.50 : 389,659.53 = 91,175.48 : x
2. Step 2: Convert to fraction form
   259,659.50/389,659.53 = 91,175.48/x
3. Step 3: Cross multiply
   259,659.50x = 389,659.53 × 91,175.48
4. Step 4: Simplify right side
   259,659.50x = 35,527,392,736.03
5. Step 5: Solve for x
   x = 35,527,392,736.03/259,659.50
6. Step 6: Final answer
   x = 136,823.01