Finding the Fourth Proportional to 108,170.78, 149,178.72 and 90,081.41

Step by Step Solution

1. Step 1: Write the proportion equation
   108,170.78 : 149,178.72 = 90,081.41 : x
2. Step 2: Convert to fraction form
   108,170.78/149,178.72 = 90,081.41/x
3. Step 3: Cross multiply
   108,170.78x = 149,178.72 × 90,081.41
4. Step 4: Simplify right side
   108,170.78x = 13,438,229,439.60
5. Step 5: Solve for x
   x = 13,438,229,439.60/108,170.78
6. Step 6: Final answer
   x = 124,231.60