Finding the Fourth Proportional to 128,091.70, 192,144.56 and 53,219.42

Step by Step Solution

1. Step 1: Write the proportion equation
   128,091.70 : 192,144.56 = 53,219.42 : x
2. Step 2: Convert to fraction form
   128,091.70/192,144.56 = 53,219.42/x
3. Step 3: Cross multiply
   128,091.70x = 192,144.56 × 53,219.42
4. Step 4: Simplify right side
   128,091.70x = 10,225,820,945.58
5. Step 5: Solve for x
   x = 10,225,820,945.58/128,091.70
6. Step 6: Final answer
   x = 79,832.03