Finding the Fourth Proportional to 91,556.32, 137,196.56 and 81,578.94

Step by Step Solution

1. Step 1: Write the proportion equation
   91,556.32 : 137,196.56 = 81,578.94 : x
2. Step 2: Convert to fraction form
   91,556.32/137,196.56 = 81,578.94/x
3. Step 3: Cross multiply
   91,556.32x = 137,196.56 × 81,578.94
4. Step 4: Simplify right side
   91,556.32x = 11,192,349,936.45
5. Step 5: Solve for x
   x = 11,192,349,936.45/91,556.32
6. Step 6: Final answer
   x = 122,245.52