Finding the Fourth Proportional to 259,738.25, 389,646.33 and 91,228.88

Step by Step Solution

1. Step 1: Write the proportion equation
   259,738.25 : 389,646.33 = 91,228.88 : x
2. Step 2: Convert to fraction form
   259,738.25/389,646.33 = 91,228.88/x
3. Step 3: Cross multiply
   259,738.25x = 389,646.33 × 91,228.88
4. Step 4: Simplify right side
   259,738.25x = 35,546,996,333.78
5. Step 5: Solve for x
   x = 35,546,996,333.78/259,738.25
6. Step 6: Final answer
   x = 136,857.00