Finding the Fourth Proportional to 259,677.12, 389,558.72 and 91,153.72

Step by Step Solution

1. Step 1: Write the proportion equation
   259,677.12 : 389,558.72 = 91,153.72 : x
2. Step 2: Convert to fraction form
   259,677.12/389,558.72 = 91,153.72/x
3. Step 3: Cross multiply
   259,677.12x = 389,558.72 × 91,153.72
4. Step 4: Simplify right side
   259,677.12x = 35,509,726,486.44
5. Step 5: Solve for x
   x = 35,509,726,486.44/259,677.12
6. Step 6: Final answer
   x = 136,745.69