Finding the Fourth Proportional to 120,196.59, 180,197.69 and 50,128.35

Step by Step Solution

1. Step 1: Write the proportion equation
   120,196.59 : 180,197.69 = 50,128.35 : x
2. Step 2: Convert to fraction form
   120,196.59/180,197.69 = 50,128.35/x
3. Step 3: Cross multiply
   120,196.59x = 180,197.69 × 50,128.35
4. Step 4: Simplify right side
   120,196.59x = 9,033,012,622.87
5. Step 5: Solve for x
   x = 9,033,012,622.87/120,196.59
6. Step 6: Final answer
   x = 75,151.99