Finding the Fourth Proportional to 236,399.62, 326,225 and 128,969.62

Step by Step Solution

1. Step 1: Write the proportion equation
   236,399.62 : 326,225 = 128,969.62 : x
2. Step 2: Convert to fraction form
   236,399.62/326,225 = 128,969.62/x
3. Step 3: Cross multiply
   236,399.62x = 326,225 × 128,969.62
4. Step 4: Simplify right side
   236,399.62x = 42,073,114,284.50
5. Step 5: Solve for x
   x = 42,073,114,284.50/236,399.62
6. Step 6: Final answer
   x = 177,974.54