Finding the Fourth Proportional to 200,018.91, 275,896.04 and 128,285.31

Step by Step Solution

1. Step 1: Write the proportion equation
   200,018.91 : 275,896.04 = 128,285.31 : x
2. Step 2: Convert to fraction form
   200,018.91/275,896.04 = 128,285.31/x
3. Step 3: Cross multiply
   200,018.91x = 275,896.04 × 128,285.31
4. Step 4: Simplify right side
   200,018.91x = 35,393,409,019.17
5. Step 5: Solve for x
   x = 35,393,409,019.17/200,018.91
6. Step 6: Final answer
   x = 176,950.31