Finding the Fourth Proportional to 85,412.19, 128,196.41 and 43,321.33

Step by Step Solution

1. Step 1: Write the proportion equation
   85,412.19 : 128,196.41 = 43,321.33 : x
2. Step 2: Convert to fraction form
   85,412.19/128,196.41 = 43,321.33/x
3. Step 3: Cross multiply
   85,412.19x = 128,196.41 × 43,321.33
4. Step 4: Simplify right side
   85,412.19x = 5,553,638,982.43
5. Step 5: Solve for x
   x = 5,553,638,982.43/85,412.19
6. Step 6: Final answer
   x = 65,021.62