Finding the Fourth Proportional to 85,431.72, 128,159.82 and 26,272.34

Step by Step Solution

1. Step 1: Write the proportion equation
   85,431.72 : 128,159.82 = 26,272.34 : x
2. Step 2: Convert to fraction form
   85,431.72/128,159.82 = 26,272.34/x
3. Step 3: Cross multiply
   85,431.72x = 128,159.82 × 26,272.34
4. Step 4: Simplify right side
   85,431.72x = 3,367,058,365.38
5. Step 5: Solve for x
   x = 3,367,058,365.38/85,431.72
6. Step 6: Final answer
   x = 39,412.27