Finding the Fourth Proportional to 85,839.48, 128,816.34 and 35,279.97

Step by Step Solution

1. Step 1: Write the proportion equation
   85,839.48 : 128,816.34 = 35,279.97 : x
2. Step 2: Convert to fraction form
   85,839.48/128,816.34 = 35,279.97/x
3. Step 3: Cross multiply
   85,839.48x = 128,816.34 × 35,279.97
4. Step 4: Simplify right side
   85,839.48x = 4,544,636,610.71
5. Step 5: Solve for x
   x = 4,544,636,610.71/85,839.48
6. Step 6: Final answer
   x = 52,943.43