Finding the Fourth Proportional to 128,499.93, 192,768.32 and 39,760.38

Step by Step Solution

1. Step 1: Write the proportion equation
   128,499.93 : 192,768.32 = 39,760.38 : x
2. Step 2: Convert to fraction form
   128,499.93/192,768.32 = 39,760.38/x
3. Step 3: Cross multiply
   128,499.93x = 192,768.32 × 39,760.38
4. Step 4: Simplify right side
   128,499.93x = 7,664,541,754.56
5. Step 5: Solve for x
   x = 7,664,541,754.56/128,499.93
6. Step 6: Final answer
   x = 59,646.27