Finding the Fourth Proportional to 131,168.40, 196,456.56 and 91,900.80

Step by Step Solution

1. Step 1: Write the proportion equation
   131,168.40 : 196,456.56 = 91,900.80 : x
2. Step 2: Convert to fraction form
   131,168.40/196,456.56 = 91,900.80/x
3. Step 3: Cross multiply
   131,168.40x = 196,456.56 × 91,900.80
4. Step 4: Simplify right side
   131,168.40x = 18,054,515,029.25
5. Step 5: Solve for x
   x = 18,054,515,029.25/131,168.40
6. Step 6: Final answer
   x = 137,643.78