Finding the Fourth Proportional to 259,715.70, 389,524.34 and 91,196.42

Step by Step Solution

1. Step 1: Write the proportion equation
   259,715.70 : 389,524.34 = 91,196.42 : x
2. Step 2: Convert to fraction form
   259,715.70/389,524.34 = 91,196.42/x
3. Step 3: Cross multiply
   259,715.70x = 389,524.34 × 91,196.42
4. Step 4: Simplify right side
   259,715.70x = 35,523,223,591.23
5. Step 5: Solve for x
   x = 35,523,223,591.23/259,715.70
6. Step 6: Final answer
   x = 136,777.34