Finding the Fourth Proportional to 128,443.56, 192,666.78 and 57,369.81

Step by Step Solution

1. Step 1: Write the proportion equation
   128,443.56 : 192,666.78 = 57,369.81 : x
2. Step 2: Convert to fraction form
   128,443.56/192,666.78 = 57,369.81/x
3. Step 3: Cross multiply
   128,443.56x = 192,666.78 × 57,369.81
4. Step 4: Simplify right side
   128,443.56x = 11,053,256,561.91
5. Step 5: Solve for x
   x = 11,053,256,561.91/128,443.56
6. Step 6: Final answer
   x = 86,055.36