Finding the Fourth Proportional to 85,945.32, 128,573.38 and 71,183

Step by Step Solution

1. Step 1: Write the proportion equation
   85,945.32 : 128,573.38 = 71,183 : x
2. Step 2: Convert to fraction form
   85,945.32/128,573.38 = 71,183/x
3. Step 3: Cross multiply
   85,945.32x = 128,573.38 × 71,183
4. Step 4: Simplify right side
   85,945.32x = 9,152,238,908.54
5. Step 5: Solve for x
   x = 9,152,238,908.54/85,945.32
6. Step 6: Final answer
   x = 106,489.09