Finding the Fourth Proportional to 128,782.39, 193,185.89 and 40,012.06

Step by Step Solution

1. Step 1: Write the proportion equation
   128,782.39 : 193,185.89 = 40,012.06 : x
2. Step 2: Convert to fraction form
   128,782.39/193,185.89 = 40,012.06/x
3. Step 3: Cross multiply
   128,782.39x = 193,185.89 × 40,012.06
4. Step 4: Simplify right side
   128,782.39x = 7,729,765,421.83
5. Step 5: Solve for x
   x = 7,729,765,421.83/128,782.39
6. Step 6: Final answer
   x = 60,021.91