Finding the Fourth Proportional to 108,128.19, 149,229.59 and 89,946.80

Step by Step Solution

1. Step 1: Write the proportion equation
   108,128.19 : 149,229.59 = 89,946.80 : x
2. Step 2: Convert to fraction form
   108,128.19/149,229.59 = 89,946.80/x
3. Step 3: Cross multiply
   108,128.19x = 149,229.59 × 89,946.80
4. Step 4: Simplify right side
   108,128.19x = 13,422,724,794.91
5. Step 5: Solve for x
   x = 13,422,724,794.91/108,128.19
6. Step 6: Final answer
   x = 124,137.14