Finding the Fourth Proportional to 85,667.40, 128,435.22 and 43,512.84

Step by Step Solution

1. Step 1: Write the proportion equation
   85,667.40 : 128,435.22 = 43,512.84 : x
2. Step 2: Convert to fraction form
   85,667.40/128,435.22 = 43,512.84/x
3. Step 3: Cross multiply
   85,667.40x = 128,435.22 × 43,512.84
4. Step 4: Simplify right side
   85,667.40x = 5,588,581,178.22
5. Step 5: Solve for x
   x = 5,588,581,178.22/85,667.40
6. Step 6: Final answer
   x = 65,235.80