Finding the Fourth Proportional to 139,016.16, 191,952.72 and 128,401.92

Step by Step Solution

1. Step 1: Write the proportion equation
   139,016.16 : 191,952.72 = 128,401.92 : x
2. Step 2: Convert to fraction form
   139,016.16/191,952.72 = 128,401.92/x
3. Step 3: Cross multiply
   139,016.16x = 191,952.72 × 128,401.92
4. Step 4: Simplify right side
   139,016.16x = 24,647,097,797.22
5. Step 5: Solve for x
   x = 24,647,097,797.22/139,016.16
6. Step 6: Final answer
   x = 177,296.64