Finding the Fourth Proportional to 85,817.38, 128,636.70 and 28,849

Step by Step Solution

1. Step 1: Write the proportion equation
   85,817.38 : 128,636.70 = 28,849 : x
2. Step 2: Convert to fraction form
   85,817.38/128,636.70 = 28,849/x
3. Step 3: Cross multiply
   85,817.38x = 128,636.70 × 28,849
4. Step 4: Simplify right side
   85,817.38x = 3,711,040,158.30
5. Step 5: Solve for x
   x = 3,711,040,158.30/85,817.38
6. Step 6: Final answer
   x = 43,243.46