Finding the Fourth Proportional to 128,086.71, 191,998.80 and 53,250.27

Step by Step Solution

1. Step 1: Write the proportion equation
   128,086.71 : 191,998.80 = 53,250.27 : x
2. Step 2: Convert to fraction form
   128,086.71/191,998.80 = 53,250.27/x
3. Step 3: Cross multiply
   128,086.71x = 191,998.80 × 53,250.27
4. Step 4: Simplify right side
   128,086.71x = 10,223,987,939.68
5. Step 5: Solve for x
   x = 10,223,987,939.68/128,086.71
6. Step 6: Final answer
   x = 79,820.83