Finding the Fourth Proportional to 128,665.45, 193,016.81 and 39,926.10

Step by Step Solution

1. Step 1: Write the proportion equation
   128,665.45 : 193,016.81 = 39,926.10 : x
2. Step 2: Convert to fraction form
   128,665.45/193,016.81 = 39,926.10/x
3. Step 3: Cross multiply
   128,665.45x = 193,016.81 × 39,926.10
4. Step 4: Simplify right side
   128,665.45x = 7,706,408,457.74
5. Step 5: Solve for x
   x = 7,706,408,457.74/128,665.45
6. Step 6: Final answer
   x = 59,894.93